Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2b883257b3c0d1…

MALICIOUS

PDF

76.0 KB Created: 2020-12-16 23:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b5a6a71863ac282cfb2410b4defbc3 SHA-1: d36728048ea324965455b5b5098dd3f0fc004060 SHA-256: 9b2b883257b3c0d17890b9311da223a2024ac48cd2ad5df7ed270605450c494f
262 Risk Score

Malware Insights

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

The PDF contains a lure for an advance-fee scam, presenting itself as a worksheet with answers. It embeds multiple links, one of which, 'https://ggtraff.ru/strik?utm_term=section+11-1+the+work+of+gregor+mendel+worksheet+answers', is flagged as a malicious redirector. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of malicious redirector links and the advance-fee scam lure strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?utm_term=section+11-1+the+work+of+gregor+mendel+worksheet+answers
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/f9a710e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pozokimepe/clark_rubber_foam_sheets.pdf
    • https://s3.amazonaws.com/suzujewa/autodesk_maya_2008_crack_free.pdf
    • https://static1.squarespace.com/static/5fc784a563393450185475e5/t/5fd66809313c42342b8dfd74/1607886859688/donation_letter_template_for_nonprofit_organization.pdf
    • https://s3.amazonaws.com/daniwodug/67030984990.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf1b12edfcd2bda907234/1606218172665/glacier_bay_water_dispenser_blue_light_not_on.pdf
    • https://s3.amazonaws.com/jezaxojipevu/tekesafesofexefeb.pdf
    • https://s3.amazonaws.com/dojonuta/corel_painter_2020_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/ec00aba8-e51e-49d9-9b91-cfea53d771ff/intrepid_class_starship_deck_plans.pdf
    • https://static1.squarespace.com/static/5fc0e2ed17e7202640ea1bf0/t/5fc4185f5147b14804b33920/1606686816976/80111644487.pdf
    • https://s3.amazonaws.com/ginutu/rotamogawo.pdf
    • https://uploads.strikinglycdn.com/files/6f1a9f5f-93b0-46c0-8db7-87b5fbaee58c/super_mario_odyssey_mushroom_kingdom_moons.pdf
    • https://s3.amazonaws.com/fedufiporara/53087829485.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe24333570fb44d1cc5462/1606296627597/65286211325.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_off0000e7b0.bin
64375f88faa987394686e4186e88f6d034bd198d48bf26dd666ac4e0aa68766e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 5780 bytes
font_01_sfnt_off0000fb55.bin
2538570ef86452b55335f24fb2a8e0b3cca70045cccb695baf835a49223a9eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 11708 bytes

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