Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c637027bba615…

MALICIOUS

PDF

49.9 KB Authoring application: LibreOffice
MD5: cd5f587c1203aeb640754f338e60d5be SHA-1: 24f5b12b0255abbe5673b0f7cf59d52ce51fb402 SHA-256: 4a8c637027bba6157e953b169df19a1d341d3080f37e9221d79af7c2254c700a
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to external websites, identified by the PDF_SEO_LINK_FARM heuristic. This strongly suggests a phishing or malware distribution campaign. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports this assessment. No scripts were extracted from this sample, but the link farm is sufficient evidence for the attack pattern.

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://kendubner.net/uploads/1/3/0/5/130589103/e83228f.pdf
    • http://www.justmakemehappy.co.uk/uploads/1/3/0/2/130289096/musexajal.pdf
    • http://bohemma.com/uploads/1/3/0/6/130639410/76af1cda35d3.pdf
    • http://mychamberofsecretss.com/uploads/1/3/0/7/130739719/f13b26dcd37f79.pdf
    • http://cumcloset.com/uploads/1/3/0/3/130323097/6b6acdc4f31d17.pdf
    • http://1stnationalbuilders.com/uploads/1/3/0/6/130604312/gugikavibe-voxemisek.pdf
    • http://hbcwetaskiwin.com/uploads/1/3/0/6/130639249/konufutijex.pdf
    • http://hostmaster.lonelyatthetopcoaching.co.uk/uploads/1/3/0/2/130272631/7ceced132f.pdf
    • http://andeverythingniceantiques.com/uploads/1/3/0/4/130478831/venawenuvu_nilibumaxubin_kodupe.pdf
    • http://birthworkerinclusivity.com/uploads/1/3/0/9/130969545/2241164.pdf
    • http://www.amazingpuppiesgarden.com/uploads/1/3/0/5/130589251/984d9d101dcb.pdf
    • http://misssoutheastpageantry.us/uploads/1/3/0/7/130740510/130740510.html#form+i-864a+cost

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c7a.bin
183cd94b3038ad6ee9cb51d6b941958158ba2860a1a947288a162f7ad77b345a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7A 8196 bytes

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