Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27ee640fc7adb22…

MALICIOUS

PDF

42.3 KB Authoring application: Inkscape
MD5: 0fba8fac85f40315d18c80bcc3ea831d SHA-1: 9875b02a37d535e6b924728a51107577f22b4e96 SHA-256: b27ee640fc7adb22a32dd354baec75d1570429d371434a79e2f30d082df6916b
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating a large number of external links. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output further support its malicious nature. The document body, though truncated, contains references to 'Tnusrb answer key 2019' and embeds multiple URLs, suggesting a phishing or redirection lure. The primary attack pattern involves directing users to a farm of other PDF documents hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://007securitynetworking.com/uploads/1/3/0/6/130605080/mekewabajofevilasi.pdf
    • http://namastamyoga.com/uploads/1/3/0/4/130478067/582226.pdf
    • http://accessmudjimbashores.com/uploads/1/3/0/3/130323229/vililofepefigebupe.pdf
    • http://meridiansq.com/uploads/1/3/0/3/130323600/27241dc8d5fe8.pdf
    • https://tupuwuxobe.weebly.com/uploads/1/3/0/4/130489410/kuvusixekej_lunubufotixi_nonime.pdf
    • http://northenddeli.com/uploads/1/3/0/4/130483394/130483394.html#tnusrb+answer+key+2019

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010db.bin
2491e4114ac5e5d095d053e63ac067fbf8e057653ff350a2b956febb2bca86ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB 8768 bytes
font_01_sfnt_off00005df3.bin
8de1c50b6fdf31da550d1a1d377b9c73d3d062f6b8e5e8eaf00713d6709eb779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF3 16328 bytes

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