Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76b1ba08c8d2e96…

MALICIOUS

PDF

55.5 KB Created: 2020-10-25 03:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3845c59d57a342af5ea22087a874b159 SHA-1: 8a2f0a4dabe092dce823c568513a1bc40a497d37 SHA-256: f76b1ba08c8d2e96a73be0cd30f865cfc65c33122a6c57fe580ff96ef5540740
184 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting, designed to create a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and the document body itself contains a URL that appears to be part of this lure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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.club/123?keyword=ghost+of+spirit+bear+pdf+free In PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/lujibodisu_kawoviwazazosi.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/5996138.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/dowulonejikokul.pdfIn PDF document text
    • https://darurirajilubi.weebly.com/uploads/1/3/4/3/134318819/25ee396fe4f.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/e9529680330d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5f915954c492f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8f602521eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8732233d784.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/fa52e990-cd71-4871-9766-4dd043c5257b/wudawekese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d2cea2-c260-4db0-ba1a-ccc2a973e947/campanas_de_colorear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5e0551-f21a-4b11-8498-0528f56309e6/nutodevimexexot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b29447e-e889-4ed3-a4f9-72f91b019fe4/zudamilunulajanasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5e2ae7-a9f6-4a93-af2b-6affdc960c2e/gemurenufutuxape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/tobinab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7625/3375/files/android_9.0_pie_samsung_j5_prime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2812/0217/files/begone_unblocked_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8985/7174/files/dnd_5e_grung_name_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/31114956934.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/konenegipogiki.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/nomalujimevulesiwulez.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/azure_devops_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/caballo_de_troya_1_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04b31af-8101-49bc-9a45-0292c4c57234/depimizirumalajopixoxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e3c580-9491-4bfd-8d24-9f2c56af3dcf/debukusodalitevuxavajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c39684e-27ca-485f-8a8e-fe2932c643e3/80128597130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a521061b-0a6c-43e1-b0ae-ffc2051bef08/45231229993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80ad2e8-4d0c-43cd-b1b2-301b192eeb72/22094988543.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 4948 bytes
SHA-256: c8141cd0ac6f1d3d3611e42c1fa6007cd8b409316433fb6926d507d3b0c980e7
font_01_sfnt_off00009cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB4 10460 bytes
SHA-256: 8f5abb1317811d15d16b642489cb07fc4f26c06af8b23db42f8847cc8c325b04
font_02_sfnt_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2