Malicious PDF — malware analysis report

Static analysis result for SHA-256 2931272c9fe11823…

MALICIOUS

PDF

37.6 KB Authoring application: pstoedit First seen: 2020-09-07
MD5: 2551c1f0fcae4d9812d06e655b0f3101 SHA-1: 3f3376a4d5c199cf9ea78ced7e40b294af575e50 SHA-256: 2931272c9fe11823cb3cfc8a36bfdb934955feab6445fcdf1775d63b9659b8ef
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.003 Windows Command Shell

The PDF contains a large number of external links, identified as a link farm, directing users to various websites. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a phishing or malware distribution intent. The presence of a 'LOLBin_RUN_COMMAND' heuristic indicates potential execution of malicious commands, although no specific script was extracted to detail this further. The document body, though heavily obfuscated, contains text related to 'Ielts speaking samples', used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ballyloobyns.weebly.com/uploads/1/3/0/2/130272903/2245759.pdf In PDF document text
    • http://spccmd.com/uploads/1/3/0/2/130274088/bimituvidofef.pdfIn PDF document text
    • http://flatlandultrarunner.com/uploads/1/3/0/6/130604910/1698983.pdfIn PDF document text
    • http://dirtylittleclaws.com/uploads/1/3/0/5/130546971/tugezipuzeti.pdfIn PDF document text
    • http://nobuhotelriyadh-fullsite.devsite-1.com/uploads/1/3/0/4/130483656/130483656.html#ielts+speaking+samples+with+questions+and+answers+collected+and+edited+by+davidIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7 8928 bytes
SHA-256: 62b4e74f5e0bfde578fa49a34bded5b4d4bd67272d815408c3f90108dbc9774e

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