Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc3c7bc4d002126…

MALICIOUS

PDF

71.6 KB Created: 2020-11-10 09:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 70887b72e7f62ac4d3380af5f3a88a56 SHA-1: eb0ecb2db65f3a7b594bc27d20fe5accce311fa9 SHA-256: 6fc3c7bc4d002126dc2322460bd9db2f41d7f4c664b77006ee1e9a996fe4c6a1
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming, including a critical finding for a PDF redirector link to 'traffmen.ru'. The document body, though heavily obfuscated, contains references to 'UFC modded apk' and the authoring application 'wkhtmltopdf', suggesting a lure for potentially unwanted software or malware. The presence of numerous links to disposable hosting services further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/123?keyword=ufc+modded+apk In PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/xokopumeramegaxiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418368/normal_5f96813952b58.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/0836f2c35d91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f88db972e4cd.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/gadizalisu-komikukola-dozopunemufag.pdfIn PDF document text
    • https://lifuregetarip.weebly.com/uploads/1/3/4/3/134384561/jizonowoxonida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5f9d5f358cd27.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/e89cea1f14e704a.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/gukufasemoxuzoxi.pdfIn PDF document text
    • https://semefaperovupiw.weebly.com/uploads/1/3/4/5/134507497/bigasol-bixovuzewurej-vofegivef.pdfIn PDF document text
    • https://tuvunexe.weebly.com/uploads/1/3/4/3/134327091/kaziwanugevafa_nuresudulob.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/wifevibadopunax.pdfIn 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/788c4475-f41e-406b-93d6-8a8bbdd8881a/37493312082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824186fb-f685-424e-acf4-3c9246c4be8b/27032699295.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 5048 bytes
SHA-256: b83d314fd5b2f312009ab03400cda5c661324e3c5381b01b77a0b745bdcfe611
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10792 bytes
SHA-256: 10e0fc6e2100fe729074859c59e4d9e3d804b0aa64db69970016d4dfe684494b

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