Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58e349710fc7e13…

MALICIOUS

PDF

54.3 KB Created: 2020-10-19 07:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d6f989cbf2e5d42a7cb1731707760b4b SHA-1: 7bdc7256a394b64c4b0e2f6558b4baa7bfe71be2 SHA-256: a58e349710fc7e13d235025cc2a073a634266d3f2974c9694437e5d2152c7dae
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'resume format pdf 2020' and includes the malicious URL. This indicates a phishing attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/123?keyword=latest+resume+format+pdf+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f8b6bb533f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f8c7ad932512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8aef843037d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f89248a31e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f8b060e76752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8a167a511b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f870c01cd494.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/6139733.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/nifit.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1c221f2837cd6f0.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/dalamazerozana_buwalukozoj_nuluxozudowabal.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00ebda9-1faa-4292-8bc2-20e98e47b72e/39780203241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418ce574-06b0-489d-b82f-bfb8ed6d0c73/3079628644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8559ceba-c2f5-42ac-b7df-d2593bb02b20/51111703074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0627e46e-e159-4488-b195-e3b2804ebdf4/tewar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1870aa-1a72-4a5f-92cc-20e80bab73aa/oppai_slider_2_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/9722/6133/files/4000_btu_air_conditioner_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/relodegebalokex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0642/6266/files/blood_on_the_river.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/5639/8246/files/dna_coloring_transcription_and_translation_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2815/1959/files/diesel_jeans_mens_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a809efe-ce3c-419e-b439-f5db5ec62b1d/vodumowupanijugitun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3258cb3-f4cd-4b2c-b953-407390fe87d1/sokinevilekusozawapir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0beaea2-d8c8-47b1-a085-46d106ebaa20/malijupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c75b4b-60c0-4b2d-b9da-aaf44e519154/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f366e6ce-15a5-452f-b8cc-75ea1e131f0a/45497684796.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009161.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9161 8136 bytes
SHA-256: c40c17a88d3227ecd777996be800c30ae0d054a641e3beea567cba1f0f88217b
font_00_sfnt_off00006e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E81 4800 bytes
SHA-256: 05c10c49a31c6be40db818520cde30e0074186042012011f43caa0fe6096ff15
font_01_sfnt_off00007f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F40 5368 bytes
SHA-256: 68e780201afa5c2aa1a8f66935d47dc84fe678f28ccbb0bdfcc0548e0d21054a
font_03_sfnt_off0000a7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7CA 10080 bytes
SHA-256: 099e4d1b43d5032a136bc9a0553877a8c43a785f0ab78b57919c588e32c694f1

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