Malicious PDF — malware analysis report

Static analysis result for SHA-256 499f00a0e1c220dd…

MALICIOUS

PDF

79.1 KB Created: 2020-12-28 06:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8fbfbc7c9b3cbc8dde38e82cc35322d SHA-1: 1b153c394c2f4db0d2f732ed0c3b4d7877921f2a SHA-256: 499f00a0e1c220dd97c366b84a012cfe6446e7bc00d99fd3780d5ef39735bc75
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. While no scripts were extracted, the document's structure and embedded URLs are sufficient to classify it as a malicious redirector.

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://cctraff.ru/aws?utm_term=crash+bandicoot+tag+team+racing+pc
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/sivutova.pdf
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd19a6d78250.pdf
    • https://cdn-cms.f-static.net/uploads/4446400/normal_5fa5309ca622c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de4369c1-cf2f-4921-a155-cfa1b0452e95/rx8_body_kit_malaysia.pdf
    • https://s3.amazonaws.com/mupakijivuruzim/53951974282.pdf
    • https://uploads.strikinglycdn.com/files/5f50de46-6a51-4cfd-8c4d-0f9f0dadbb30/manual_for_whirlpool_cabrio_washer_model_wtw5500xw0.pdf
    • https://s3.amazonaws.com/solonebosop/66387099096.pdf
    • https://uploads.strikinglycdn.com/files/94bdfc9b-d393-46a8-8091-1e8ff1a93881/bikifunekimifud.pdf
    • https://s3.amazonaws.com/bunobu/oregon_scoring_guide_writing_rubric.pdf
    • https://s3.amazonaws.com/nitirew/gepirirekuki.pdf
    • https://uploads.strikinglycdn.com/files/0f39c3b2-4a5f-44b4-9428-9291f7dc1ce3/muvotawozipigunujib.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_off0000f8ff.bin
0e25306180576ad1e6a4d4412129b6ebdaa00bb9005b0b3679f29d36b2335b90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 5500 bytes
font_01_sfnt_off00010b7a.bin
43090b64d6fada8863c0df4c0d27da744f5a2f1a1080b5430cc37b93e2a2f83c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10508 bytes