Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad016503b1a771…

MALICIOUS

PDF

87.7 KB Created: 2020-11-10 11:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3b3dd3e52a65d0d2f07af72dc4fe07a SHA-1: d501f96e5ad421c97765c2f2dea11ba4463e52a5 SHA-256: 4aad016503b1a7717634fd90d309599e1efc0108225dc955cdd0542c55c19234
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?keyword=takashi+shimizu+age
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5f9df88b354f7.pdf
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f99b152762cc.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f8a7369bf738.pdf
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5f9834b3540d9.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f8b9b326a2c7.pdf
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87118c1233d.pdf
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/2611073.pdf
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8b99661f44e.pdf
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8ebb2fbae17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fikuvine/49695862014.pdf
    • https://s3.amazonaws.com/zaxuledo/11271273065.pdf
    • https://s3.amazonaws.com/xeroguru/candlesticks_signals.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c01b.bin
664cefd3e47d1553dd32d85f358980ff1cfee160da01832016ac2145ea24d8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC01B 20808 bytes
font_01_sfnt_off00010266.bin
9ed15990a48b0206e30a13c536a912d0be59f12ca0d450194278090696e1bbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 5032 bytes
font_02_sfnt_off0001136f.bin
e6190842fab883853291f5cce26fa13c0a3c0ade1deef1c946229142aa7616c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 11744 bytes
font_03_sfnt_off000139f3.bin
3d4749d6100daadf53acbf3b8f0af377f764a48496e0806ab6baa0478a5fbb9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F3 16364 bytes

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