Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb9662ad8d0266d…

MALICIOUS

PDF

78.3 KB Created: 2020-12-16 02:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97cf71ab4fecc17a4a8de820cd3a1032 SHA-1: d1b6bf90cd763740701208e4aeafbfcbd0203f40 SHA-256: 8bb9662ad8d0266dcec80fc511a07708d7e395a36d74bb73294d41e5024f08f2
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a large number of external PDF links, indicative of a link farm. ClamAV and ML classifiers also flagged this file as malicious. The primary malicious URL identified is traffmen.ru, which is used to redirect to a PDF link farm.

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://traffmen.ru/aws?utm_term=goner+sheet+music
    • https://static.s123-cdn-static.com/uploads/4412908/normal_5fcacead70b41.pdf
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/4dfda2.pdf
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5f96939993d5d.pdf
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5fd8d2285d1c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanebavifamopez/77958095449.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/problem_solving_skills_training_manual.pdf
    • https://s3.amazonaws.com/gadumagabusodel/zexifevani.pdf
    • https://s3.amazonaws.com/jesidofefe/exit_4_clarksville_tn.pdf
    • https://s3.amazonaws.com/sodoxi/pugijunawasu.pdf
    • https://s3.amazonaws.com/fosagoba/kuzodivujavirej.pdf
    • https://s3.amazonaws.com/farowug/cisco_unified_attendant_console_standard_configuration_guide.pdf
    • https://static1.squarespace.com/static/5fc5936eaffbf90a660a4a03/t/5fcd1df8e43f2b00a8af741f/1607278073490/63909838571.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb9664a3cc4058a491d0/1606220696587/tuladunam.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16a.bin
569a6941dc245e7ea99faf1a8b54566464a1346ce26f19843adb3d7ab8339301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 4828 bytes
font_01_sfnt_off0000f1b1.bin
b671d31f61df5b7c7396c499405e54e732822bb5cecc79d2606c78bc416d6f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 11040 bytes
font_02_sfnt_off00011754.bin
84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16100 bytes

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