Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6a05d9ada7c99a…

MALICIOUS

PDF

111.4 KB Created: 2021-01-01 09:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c3b48d9f19ddcd01b7b9d5d47913143b SHA-1: 9d063105d01ebfca2fe7455b7b8858354c94b871 SHA-256: af6a05d9ada7c99ab66004cb8fa97451604d61fe246e578420b1c41875653dd0
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=motocross+meltdown+apk+obb'. This URL is also flagged as a high-severity SEO redirector link, suggesting a phishing lure for a free download. The ML classifier and ClamAV also strongly indicate maliciousness. No scripts were extracted, but the presence of a malicious redirector implies an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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?utm_term=motocross+meltdown+apk+obb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5f8d33d8523f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5fad8c3082d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_5fc2d3650f74d.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/8jahevD/kedatoradi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5fd3cccddb6f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f8e563031311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fc24cb163f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5f8b77a6ea2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fbafdc22acac.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/kosamupim/offline_dictionary_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/audace_ph_performance_anti_dandruff_shampoo_review.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15499 5520 bytes
SHA-256: 91875814204a2caa7b85b9609d56768eaad0f80ef5955bd107d6ffa28a30fcb2
font_01_sfnt_off00016754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16754 1796 bytes
SHA-256: d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
font_02_sfnt_off00016fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE0 12208 bytes
SHA-256: 46b1d2211b42c218c45ed74cf44c551a0c86ec177b501ac5c0d8db5b53ebea9d
font_03_sfnt_off00019937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19937 16552 bytes
SHA-256: c891954afbd96847138ae9745020c2899f1ac1abc4e053558ee4dce94902318e

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