Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c8b4d95212188d…

MALICIOUS

PDF

45.4 KB Created: 2020-08-24 09:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c5151aebcccba9a9e6d5a708e1b61d SHA-1: d5d5a2b949dd2c76bbad06a93871ebdab6529221 SHA-256: 71c8b4d95212188d54c74c611414573a58312e4d873730a7bdb59fb061a595c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though obfuscated, contains text related to 'uco english education degree sheet' and the malicious URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.com/pify?keyword=uco+english+education+degree+sheet
    • http://files.apayuq.com/uploads/1/3/1/4/131454172/bimuwubuj.pdf
    • http://kuginokan.creativempartners.com/uploads/1/3/1/4/131455069/fd919d57.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/40596821153.pdf
    • https://cdn.shopify.com/s/files/1/0457/3013/6230/files/league_of_angels_paradise_land_formation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/bucket_elevator_chain.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/61167683931.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/73754255539.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/wugawuruze.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/57619045382.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/2nd_conditional_in_reported_speech.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/kapusuzujorowami.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/94843685768.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/32472053507.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/fexiwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/gun_shooter_game_apkpure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006692.bin
0641e48100ecb9ca549a313773f45019681ccd3a9133be48b7c085a2227d167a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6692 5072 bytes
font_01_sfnt_off000077bb.bin
ae04cf3895d163ba4bda6eb06507a55ae35ca21bed3358281a09d3e6c2cb31bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BB 10180 bytes
font_02_sfnt_off00009a6d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6D 4324 bytes

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