Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b802f7095356d05…

MALICIOUS

PDF

33.6 KB Authoring application: Nitro PDF
MD5: d9a11451630dd94d0e77d4bbb4500c67 SHA-1: e649f4a3c8dd78e5b7007036bf652d771295e241 SHA-256: 4b802f7095356d052859601eb26e27d6932452df6fcb983028b790b5f89764c0
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious link being http://300davidsonave.com/uploads/1/3/0/5/130589241/9323750.pdf. ClamAV also detected this as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', indicating a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains references to educational content ('Inferring character traits worksheet') to mask its malicious intent.

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://300davidsonave.com/uploads/1/3/0/5/130589241/9323750.pdf
    • https://fekojiseguse.weebly.com/uploads/1/3/0/6/130605285/065faa571d.pdf
    • https://ruvaxedata.weebly.com/uploads/1/3/0/4/130488616/9a0404f481.pdf
    • http://restauracjanawyspie.pl/uploads/1/3/0/5/130590637/2c737a2.pdf
    • http://lenderrealtyservices.com/uploads/1/3/0/6/130620828/jiralefamizegoxavip.pdf
    • http://mogi.blogfule.ru/uploads/2020/01/27/xulekefome-robigixojogemeg-xutuzigagizenod-faxidijel.pdf
    • http://ambreenrazia.com/uploads/1/3/0/5/130542727/6661742.pdf
    • http://tet.pp-offer.club/uploads/2020/01/27/faxonukorazazu.pdf
    • http://thelohbros.com/uploads/1/3/0/6/130622013/batotowafebeti.pdf
    • http://misbailes.com/uploads/1/3/0/2/130289669/130289669.html#inferring+character+traits+worksheet

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011c5.bin
a935d34dc45b7ea11351837a10c74e91b528637b87b33705065284163a155135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5 7228 bytes

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