Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e8119a347aa1be…

MALICIOUS

PDF

57.6 KB Created: 2020-10-15 04:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7994273d4d0af2be12a427b8eadbdf42 SHA-1: dc1b831f6f65fd4992a451733a05a58283afe8b0 SHA-256: 15e8119a347aa1beedda84214740edaf5d17eb4b8e5bf614306bcce61a4db72e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external PDFs, forming a link farm. One of these links, https://gettraff.ru/123?keyword=hyperion+launcher+pro+apk+v50, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several other PDF links, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/123?keyword=hyperion+launcher+pro+apk+v50 In PDF document text
    • https://site-1040391.mozfiles.com/files/1040391/gusanizamudasativafonud.pdfIn PDF document text
    • https://site-1039577.mozfiles.com/files/1039577/kediberuxuvawowekekase.pdfIn PDF document text
    • https://site-1039684.mozfiles.com/files/1039684/zorivekubalurerufodumobo.pdfIn PDF document text
    • https://site-1040562.mozfiles.com/files/1040562/25833928354.pdfIn PDF document text
    • https://site-1038782.mozfiles.com/files/1038782/64111664446.pdfIn PDF document text
    • https://site-1038988.mozfiles.com/files/1038988/voniriturujolomijogo.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/4078745.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/fisup.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/xovejaxikufu_kosev.pdfIn PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/c6231.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/86f180b4-e261-4ff0-a0b6-4a05eb613f5a/69846809005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24a27af-d3b2-4ac8-9410-61a824e1848f/zezozevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a8a2b9-e64d-48e4-8b12-1c8ae5fe4ec3/vovujomuvufawibo.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CF 5096 bytes
SHA-256: c2c72cacfb5a8ae1fb4e8f97d5f3a03950cc5d67cbf9f60a69c86a2f11a6e8ba
font_01_sfnt_off0000790d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790D 8184 bytes
SHA-256: 0f668e44e7dd60c212eb7c790c839010d6987d35e2c47f920d5a4bfd4c15f841
font_02_sfnt_off00009421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9421 10024 bytes
SHA-256: ea4a8b76613878ef7e762bad1581d7e9a0f625b75027b962f17ba41195873ac0
font_03_sfnt_off0000b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 16096 bytes
SHA-256: 98e9bc0052842df98938b94381576195c9747b944405e0c94c4e0d0acc2cea67
font_04_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378