Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6b0f8214df995a…

MALICIOUS

PDF

55.1 KB Authoring application: Pdftk
MD5: 17f13e2fae55c0cd23fc50fb8bfcf03d SHA-1: 0fc3d7aa71c7c0854d259ab396c08720091dc057 SHA-256: 8c6b0f8214df995ad41175b92f9af3d4e393d24d96a247a0d64642662dbb8aa0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded URLs are likely used to redirect users to malicious websites or for SEO spamming purposes. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://realmandrake.com/uploads/1/3/0/5/130539843/dusem.pdf
    • http://sjhameed.com/uploads/1/3/0/3/130312944/49df6137d8a.pdf
    • http://slocampnpack.com/uploads/1/3/0/5/130551303/286429.pdf
    • http://kylealpha.com/uploads/1/3/0/4/130488861/fiwuxusubekil-roviziz-kamomorifi.pdf
    • http://myhypecheck.com/uploads/1/3/0/5/130551349/duguw.pdf
    • http://sidemountainspecialtyfoods.com/uploads/1/3/0/5/130588983/dbfc9dc.pdf
    • http://thesupporthelp247.com/uploads/1/3/0/5/130590698/1359645.pdf
    • http://myfavoriteplacesrdev250.com/uploads/1/3/0/6/130622103/kukuro.pdf
    • http://chunkeymonkey40.com/uploads/1/3/0/4/130477584/2382186.pdf
    • http://sharedtravel.voyagerwebsites.com/uploads/1/3/0/3/130313274/130313274.html#synthesizer+app+for+android

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011fe.bin
d546b557bde14f28245b7c80fad454ad86d7116dca9a099fd904fafe6afa616b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE 8852 bytes
font_01_sfnt_off0000925e.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925E 16036 bytes

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