Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7254d4ecab4754…

MALICIOUS

PDF

41.1 KB Created: 2020-11-08 18:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3023173301d6f486473a6bcc16f6a23f SHA-1: 5d039a37e509078d6e6c15a7fd2f8ef27c46b33b SHA-256: be7254d4ecab4754976496eb617b11448d4ec6e43fc57f72e67a0aeff1205731
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm or SEO poisoning attempt to drive traffic to potentially malicious sites. The primary URL, https://trafficel.ru/123?keyword=to+kill+a+mockingbird+final+test+with+answers, appears to be a lure. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to lead users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?keyword=to+kill+a+mockingbird+final+test+with+answers
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5f9548df051cd.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f87eb2319f4b.pdf
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f9829d6870a6.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f8a6c6137f05.pdf
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5fa206fbbe43a.pdf
    • https://cdn-cms.f-static.net/uploads/4451355/normal_5fa1e6e548bdb.pdf
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5f968997d0b14.pdf
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f9e8c8dde60e.pdf
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f8dd39ea24ef.pdf
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5fa468ee01ee5.pdf
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5f94a95bda502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xanafegeze.files.wordpress.com/2020/11/81674429971.pdf
    • https://pebofasomad.files.wordpress.com/2020/11/4640944469.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_off0000629f.bin
0829234818eeb63e3649bc6712551cdc99f79ed9873fea25de41dcd0cbb1eda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 5680 bytes
font_01_sfnt_off000075d4.bin
5a99417351ba2c212b769915cddb8acc1398efe84f66d8c86b92fbb0b4f4d3d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D4 9928 bytes

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