Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a555178bd94cfd…

MALICIOUS

PDF

38.5 KB Authoring application: GIMP
MD5: b7652ff4bafed1cf88232d31fc841069 SHA-1: ed00b0c4dd3f3856d4db89c8e6756e082ceec85e SHA-256: 03a555178bd94cfd8f6b40f4ff51d02bca8c2eedecbd4d5b6f210c18cdb07f69
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as Pdf.Phishing.TtraffRobotInstall. The document body, while containing some readable text about matrix inversion, is largely obfuscated and likely serves as a lure. The primary attack pattern involves directing users to a multitude of external PDF resources.

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://rentinspanishfork.com/uploads/1/3/0/2/130289581/gafutiketotub-resabu.pdf
    • http://metrolinasprinkler.com/uploads/1/3/0/6/130603997/9ddc6d0d9ec27ec.pdf
    • http://lasijuzo.malka-cc.com/uploads/2020/01/29/8465264.pdf
    • http://caddielands.com/uploads/1/3/0/6/130639298/2047120.pdf
    • http://petermcdonnellwriter.com/uploads/1/3/0/8/130814711/wimugabibanetiv.pdf
    • http://nuovaedilart.it/uploads/1/3/0/5/130589126/5145828.pdf
    • http://associationsdesservants.fr/uploads/1/3/0/2/130272385/vefowenoripud.pdf
    • http://sirunoxez.lechenienarkomanii-ivanovo.ru/uploads/2020/01/28/5727011.pdf
    • http://msusnackbox.com/uploads/1/3/0/6/130621741/030b8dfbac241e.pdf
    • http://drjesalvaphotography.com/uploads/1/3/0/7/130739682/pamisesolizukizetudi.pdf
    • http://summerpodcastinstitute.com/uploads/1/3/0/4/130476866/ced3f9c.pdf
    • http://musesinthevineyard.com/uploads/1/3/0/4/130488101/774124.pdf
    • http://policetrailer.com/uploads/1/3/0/4/130435738/130435738.html#how+to+find+the+inverse+of+a+2+x+3+matrix

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000013b9.bin
bc72aa720a10576460f8876138cd36fba61bc4e621008e6d1aa5055c6fd60923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9 8748 bytes

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