Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ce523eeea8356a…

MALICIOUS

PDF

41.8 KB Created: 2020-11-04 10:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3d5ddfa76e22a3f2e645952eace18bf3 SHA-1: d88a67c29f11f210a41425507ea13b37d1e37388 SHA-256: 35ce523eeea8356aa6162d789e010aad9ac8ff5c66f9264c0b904d3c2bc8daf5
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/aws?keyword=cancel+orangetheory+membership+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5f906e8e60631.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/119094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_5f9c99cdc6a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5f9cdd23ba25b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5f95c330a83e8.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/6270435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/adobe_acrobat_x_pro_convert_to_word_document.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/modajavowezu.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/supply_chain_management_a_logistics_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/50169484219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48039a9-8e1b-472a-bdc3-7fdeec4061f6/94308380636.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_off0000635b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635B 5496 bytes
SHA-256: d6f028c6cdb98bb915ce696be7abf9f1addff6d4be170252048f1749caed1110
font_01_sfnt_off000075dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DC 10796 bytes
SHA-256: 4fc4516d7e7ed45f151bab2b8625477c73ea38e443ce86a63f4dd4950e472428

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