Malicious PDF — malware analysis report

Static analysis result for SHA-256 78149b1c8df58060…

MALICIOUS

PDF

43.1 KB Authoring application: QPDF
MD5: 4b4b853d530f9d0b57cdd1291e9a6f8e SHA-1: 97eb95e80720654ea516308805eb832c7b03de84 SHA-256: 78149b1c8df58060d824f9207cdeeb30a26dd7d5d3714a7f6f013f1279960bd8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as Pdf.Phishing.TtraffRobotInstall-7605656-0. The embedded URLs suggest a phishing or SEO spam campaign aimed at distributing malicious content.

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 https://kufakowawaxug.weebly.com/uploads/1/3/0/5/130544072/9333028.pdf
    • http://purirabi.vipiski-besplatno64.icu/uploads/2020/01/27/3b998a2e4.pdf
    • http://gruzodelov.ru/uploads/2020/01/27/zudutejezezeme.pdf
    • http://daviscreativeartstherapy.com/uploads/1/3/0/4/130435846/f0c8c53e1.pdf
    • http://mobilenotaryinca.com/uploads/1/3/0/2/130287462/gofupejoribitina.pdf
    • http://1287pictures.com/uploads/1/3/0/6/130604413/lugoxakuj-pizevogaserifiv-tipunodudela.pdf
    • http://wagtheworld.net/uploads/1/3/0/6/130603741/0b502762098edde.pdf
    • http://midamericanthermal.com/uploads/1/3/0/4/130436137/rufetenuju_wivufafiken.pdf
    • http://trentriverdesigns.com/uploads/1/3/0/4/130483583/130483583.html#vlsm+cidr+subnet+calculator
    • http://linux.thai.net/projects/fonts-tlwg
    • http://www.thaitux.info

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011e8.bin
d3018e4d17eab3f3395cb4e3894cde7aa63ef3d68fcbf4b7d3912ba4b76996b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8 7628 bytes
font_01_sfnt_off00005779.bin
825dbeb66390f26c2dafe519847c594efa5a0e14e1057cb529fb72653de9bbc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5779 13992 bytes

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