Malicious PDF — malware analysis report

Static analysis result for SHA-256 418fe181c6a122b6…

MALICIOUS

PDF

67.9 KB Created: 2020-12-02 00:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d7f7fbd4ecc5442dfa197bd38a36751 SHA-1: d63aed6e2baae8328111ef83b2b72fe4dc5ec51c SHA-256: 418fe181c6a122b653c0c133cd02c7bc26608b4021d8a5506ffd2a2143f60431
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous external links, many pointing to benign PDFs, suggests a link farm or SEO poisoning tactic, with the primary malicious link being the most concerning.

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://ggtraff.ru/strik?utm_term=hustlers+dvd+release+date+deutschland
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/0714a14e1.pdf
    • https://nokiziwevapof.weebly.com/uploads/1/3/4/5/134507241/41a41643db8e.pdf
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/wupotakegon.pdf
    • https://static.s123-cdn-static.com/uploads/4368742/normal_5fc4875526df3.pdf
    • https://cdn-cms.f-static.net/uploads/4471488/normal_5fbca59f09184.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc1b6de3485235c8606c682/1606530783749/3_phase_to_single_phase_vfd.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49233c6ccf69f35487e3/1606371619827/ff14_wt_3_lines.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf583aeaf37e3b6492f015/1606375483494/subway_surfers_unlock_all_characters_cheat_apk.pdf
    • https://static1.squarespace.com/static/5fc06b148139af037642cc0d/t/5fc14f9b3485235c86f76b98/1606504348134/we_and_they_lesson_plan.pdf
    • https://s3.amazonaws.com/zaxuledo/crianza_de_ganado_bovino.pdf
    • https://uploads.strikinglycdn.com/files/7a1f313f-1094-4304-9e3d-e0f1e9920d77/53725830644.pdf
    • https://static1.squarespace.com/static/5fc0ba3b0a2757459be1f9cb/t/5fc19f46f3de5e49b5a1c11d/1606524742829/peavey_vypyr_vip_2_used.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc8.bin
e2b04a76bb99343a0d39ec8a88a6a2803be892cf8492d1b1a7cb7d3f0c14b9ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC8 5048 bytes
font_01_sfnt_off0000d0e9.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 3720 bytes
font_02_sfnt_off0000dc4c.bin
925291bd06bf71469c1da3d10866c390c583e0269d7466eb630987c87a3bbe74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 11240 bytes

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