Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6a1e35e923abbf…

MALICIOUS

PDF

45.1 KB Created: 2020-11-04 08:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 07d51a011be4c0c8d68346db22799a60 SHA-1: 3768acc5f4779657f067738a5aed8fb641fe1ff8 SHA-256: 6d6a1e35e923abbfe197053d504354e28aeddfa2dd84aa99279b7c867494e626
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous embedded URLs that redirect to various external sites. One prominent URL, 'https://cctraff.ru/strik?keyword=home+depot+amerimax+hoover+dam+gutter+guard', is flagged as a malicious redirector. The document's structure and the presence of multiple links suggest an attempt to lure users to potentially harmful destinations, possibly for phishing or malware distribution.

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://cctraff.ru/strik?keyword=home+depot+amerimax+hoover+dam+gutter+guard In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_5fa206a53810f.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/8179712f8ad3384.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/c86f9b787a9.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/6601931.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/fca1b.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.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/507c8704-b884-4059-8e61-1227b6d2fcdc/thank_you_ma_m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0b35c2-bcc6-4145-8687-ff5ceec6759f/lusumuredubup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3775185-40c6-400b-8711-5c7e42bedb8a/boparipezenukiwelet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c871160-9211-406c-8548-428f8629c02a/mimesanizunu.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/assassin_s_creed_odyssey_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/pimokubegafogaze.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_off00006f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5B 5252 bytes
SHA-256: 22a80ffce3af241ce3104ffc7d081e11490ba5ea00e2ad8f6e18bbdd811b8cba
font_01_sfnt_off00008112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8112 11308 bytes
SHA-256: 68e1f185d3764cefe39e36d9a532bd22be1bb2adb377bf69bd82d2767a7d588e

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