Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f81f993e73a4c19…

MALICIOUS

PDF

63.8 KB Created: 2020-11-21 18:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62c5ec3e98f6414739cf6bc4a27bcf47 SHA-1: 1a4bc69527bfa65ed07088076420d0677f9af3b2 SHA-256: 6f81f993e73a4c194cc83227c0f6ad1e474888d9fa15a39f28a0b863e08eb00d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=thomas+the+train+toddler+bed+comforter+set
    • https://cdn-cms.f-static.net/uploads/4472768/normal_5fad94728e9f2.pdf
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5f927b02bb041.pdf
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5fa566ada09a8.pdf
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5fa708d066996.pdf
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f9e9e83e680a.pdf
    • https://gilabekavug.weebly.com/uploads/1/3/4/5/134597011/15fb2f.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f8e305b774c1.pdf
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5f92ca0eb1a07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a32c07f1-0ec4-4aed-b68a-bafa8bdd6671/gifowusuxuzetitenataf.pdf
    • https://uploads.strikinglycdn.com/files/7a45e1e8-40e6-4de8-a8fb-71126141c803/53419650771.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/11485972601.pdf
    • https://s3.amazonaws.com/zukukelejurotef/28785599921.pdf
    • https://uploads.strikinglycdn.com/files/8a0ff5df-ad83-4de3-9b7e-a250adae55d7/komivuvaja.pdf
    • https://uploads.strikinglycdn.com/files/9d9f494b-c6a1-404b-9cbc-b8d5d3d37c99/pamutobita.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7e7.bin
6e766536dc7ef3ffaf531ca416201a33c722cc53efebd95e7e143c5a8668bc7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E7 5352 bytes
font_01_sfnt_off0000c9e5.bin
3818bfcaffa2dac02eb93f455e583e2e52f26eeffcae9537c9a288ecf7ef8223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 11540 bytes

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