Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f545217b409d02…

MALICIOUS

PDF

43.3 KB Authoring application: Pdftk
MD5: 668f88df1137c45441663f7e378e6a32 SHA-1: 480f73d057977b922a83eb2869686bee71975b4b SHA-256: b6f545217b409d029f5f605c3a689dd354633fe0f2b07c5f809dd969fb782570
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links pointing to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a phishing or traffic redirection intent. The document body is heavily obfuscated and does not provide clear textual clues, but the heuristic 'PDF_SEO_LINK_FARM' strongly indicates the primary attack vector is the exploitation of link farms.

Heuristics 3

  • 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.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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 http://mse2opiodepidemic.com/uploads/1/3/0/5/130590395/40a2c88fb88bac7.pdf
    • http://worldheartsfairtrade.net/uploads/1/3/0/5/130543070/jokuveleli-mokopaletalime.pdf
    • http://manvs.ru/uploads/2020/01/28/xitufulujemix.pdf
    • http://escamuel.org/uploads/1/3/0/7/130740010/6221195.pdf
    • http://nealeythere.weebly.com/uploads/1/3/0/4/130476141/09ee97d4314c.pdf
    • http://muskegonapostolic.com/uploads/1/3/0/5/130544387/130544387.html#dhruva+songs+mp3+download

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003500.bin
2f756d485296c049b5b470e996d6fef64af83b5d4d97656cd813f2a7c414d92a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3500 8620 bytes

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