Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d40cd3a47322e4…

MALICIOUS

PDF

83.3 KB Created: 2021-01-01 09:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6ae9c6f4749efad8dd3d8b6dbdf6747f SHA-1: b66621423a949710a3d2af227ecb7048d9fd80f4 SHA-256: 97d40cd3a47322e4a1d4200c15feefe571ac5c5ee44f5e8e937f72f4dcbfc62e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'finger war strategy card games'. The presence of numerous external PDF links, including one to a potentially benignly hosted file, indicates a link farm or redirection strategy. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/strik?utm_term=finger+war+strategy+card+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_5fbb70f8bdfe6.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/nalevunatakufobukexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fb5a05862da1.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/SRR1rgM/vazaruwafija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd09d2e6-58a6-49fa-a471-130638360348/word_for_giving_back_to_society.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8472d6-e82b-41cc-8465-3d6e7207b997/89040526393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5bfc7f-09b8-467e-9dda-4c162ef51ce1/checkers_pizza_trumann_arkansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdc06a2-333d-4c33-b1c3-b137f4f39b5e/miribi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6c6590-2ba6-43b8-9f33-2b5d7995c1f4/12788781253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f479a586-366f-4650-b51b-b79b893ec500/28353326260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c186be9-20e2-4b2a-a821-c9dd68d8f753/engineering_mechanics_volume_2_dynamics_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25967b3-1d6a-4c32-9f2c-0ec25830851b/which_of_the_following_statements_about_ribozymes_is_are_correct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbccfa6-7dab-4852-822d-9aebc3a98c37/cleveland_browns_printable_football_schedule_2019.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_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 5376 bytes
SHA-256: 67d3400e74161c0b2a5caabac14545d9fbd4284a9832cfb265c43fd1b755896f
font_01_sfnt_off00011cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 10328 bytes
SHA-256: e414e3a0b2f64fe7f1efa1bd601d454c67162347d21110864628353a87eff53a

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