Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ea71bf5b6dbc9e…

MALICIOUS

PDF

39.0 KB Authoring application: Poppler-utils
MD5: 31fa654f66ff7cc779e3abb430e91780 SHA-1: 7ed0aa153c3cda7fcef776fa8922c93a7701afe7 SHA-256: a1ea71bf5b6dbc9e95c3fa3cb93d68ac0b92defa77e9f97b887e98be4d5b0618
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, with the primary one being http://mellifluousencapsulation.com/uploads/1/3/0/5/130543996/subab.pdf. This behavior, combined with ClamAV's detection of 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score, strongly suggests a phishing or redirection attempt. The document body itself is largely unreadable, but the presence of embedded URLs points to the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mellifluousencapsulation.com/uploads/1/3/0/5/130543996/subab.pdf
    • https://tokanomutet.weebly.com/uploads/1/3/0/3/130313488/3986434.pdf
    • http://moviehahd.com/uploads/1/3/0/6/130620792/sufoganebos.pdf
    • http://lenke-nauck.com/uploads/1/3/0/6/130639308/7752427.pdf
    • https://xixadizo.weebly.com/uploads/1/3/0/4/130476887/6799294.pdf
    • http://dancefitdanceacademy.com.au/uploads/1/3/0/6/130621077/dejivumuvoj_lanopapuwafilu_fekuvavabarikek.pdf
    • http://lifeneo.com/uploads/2020/01/28/6d7e5673f.pdf
    • http://myulrika.com/uploads/1/3/0/6/130620520/jepipowaj.pdf
    • http://thompsonzing.com/uploads/1/3/0/4/130435959/sibekogoli.pdf
    • http://policetrailer.com/uploads/1/3/0/4/130435573/130435573.html#web+service+description+document+template

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001204.bin
aeec46f68221a0de02ba6c69b5fa865dabdb81daeb2b28439696447c85778d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1204 7796 bytes
font_01_sfnt_off000050bc.bin
0346baf0966aa5dca87b3cc05ffe8ab532c4ea6704ec0877ad3d430563832f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50BC 16236 bytes

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