Malicious PDF — malware analysis report

Static analysis result for SHA-256 680d0ea71bfc2ab4…

MALICIOUS

PDF

70.9 KB Created: 2020-11-11 13:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b4c838ddd4be7aa13d63c4f4e7bbf2c6 SHA-1: 71c16c2f7ea83c10324649e7fa51c5ab4fded0e6 SHA-256: 680d0ea71bfc2ab467164f5853dca0d758a61cbc911fcd3aac7d932caebfaa9a
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating a link farm and an embedded URL pointing to 'trafffi.ru'. The document body, though heavily obfuscated, contains text related to 'tower defense games hacked arcadeprehacks', suggesting a lure. The presence of multiple external PDF links, including one to 's3.amazonaws.com/ganubatebedoxez/22166552556.pdf', indicates a potential SEO poisoning or link farm strategy to distribute malicious content. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?keyword=tower+defense+games+hacked+arcadeprehacks PDF link annotation
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/vazew.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/gerukimijebufifozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f88361a1e464.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/foludixavu_goxufikasa_teriwebad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5f9c057f42393.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/ganubatebedoxez/22166552556.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/punctuation_marks_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/bailey_and_love_27th.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/xodilivuwoguxebewanepa.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/fiser_absite.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/dyson_big_ball_animal_allergy_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/72654830250.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_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 5644 bytes
SHA-256: cfd7d5bbd2333bd4129fa8989b622a35961495e38ef1ff2e050706f06b758464
font_01_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 11480 bytes
SHA-256: 5889ca9f4025c5fc3077cc4048d8315d29a1b88b71eaa264ebedf39853bfe1a2

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