Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d54bded247173c…

MALICIOUS

PDF

39.1 KB Authoring application: GIMP
MD5: e96a5a08c3b5fe88ba47784dc685350c SHA-1: 6f69e895ce7d8e015f4433c659a49adadb68b275 SHA-256: b4d54bded247173c9d2a3f00ea0e3bde93188c60dbfcfbfc631b1eed495d00da
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. This behavior is flagged as critical by the PDF_SEO_LINK_FARM heuristic and is consistent with phishing or malware distribution. The ML classifier and ClamAV also strongly indicate maliciousness. No scripts were extracted from this sample.

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://blythedoll.co.uk/uploads/1/3/0/7/130739561/d1c3f8.pdf
    • http://circlecitytrade.com/uploads/1/3/0/4/130436390/rusimisanuvog.pdf
    • http://www.legacymusicca.com/uploads/1/3/0/4/130435589/vojokuxarodab.pdf
    • http://www.andysocialexperiment.com/uploads/1/3/0/5/130589198/23057.pdf
    • http://riquelmebraga.com/uploads/1/3/0/6/130639777/satenuni.pdf
    • http://faeryoaks.com/uploads/1/3/0/6/130640232/2120188.pdf
    • http://mbhomesrealestate.net/uploads/1/3/0/4/130488509/ruvipemor.pdf
    • http://vibrs.com/uploads/1/3/0/5/130546645/9098392.pdf
    • http://trenam.net/uploads/1/3/0/6/130603728/xosakepukewufit_bajajevopo_todukovegufig.pdf
    • http://adogsworld.be/uploads/1/3/0/2/130287500/de6f4ce5f.pdf
    • http://momentumva.com/uploads/1/3/0/6/130604140/jadexewabebaro-bipoj-jorizute.pdf
    • http://6iijoi.bdgct.com/uploads/1/3/0/4/130483300/130483300.html#grammar+test+for+toefl+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041db.bin
87e897d9488f8d35daad67621c354b44c3f1fc9aea0dd734399a9856ea93f968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41DB 8084 bytes

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