Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6afaa3922ff3e0…

MALICIOUS

PDF

40.1 KB Authoring application: PDFedit
MD5: a7b30a0f1641981e305f0da5d0426e46 SHA-1: 140a6d34093194155454db723d0dabbb8d4d8179 SHA-256: 5c6afaa3922ff3e0140dd36806a41682d4a4236e358da86bc0607cc5c6b0077a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a mass external PDF link farm, with numerous URLs pointing to other PDF documents. This technique is often used for SEO manipulation or to distribute malware. ClamAV detected this file as Pdf.Phishing.TtraffRobotInstall-7605656-0, and an ML classifier also flagged it as malicious. The embedded URLs are the primary indicators of compromise.

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://ketocoacher.com/uploads/1/3/0/2/130271068/7872987.pdf
    • http://saharaexchange.com/uploads/1/3/0/7/130775660/zuxoxutoliwosor_vafakosogemolu.pdf
    • http://vukupauto.ru/uploads/1/3/0/6/130639398/zosinisikufokoz.pdf
    • http://mkcinvestmentsllc.com/uploads/1/3/0/6/130639272/zudujojuke.pdf
    • http://cookingeasyfood.com/uploads/1/3/0/3/130379597/2253409.pdf
    • http://amundsenpr.com/uploads/1/3/0/6/130604690/panozipafobe_jixupolu_subefapim.pdf
    • http://manylabs.net/uploads/1/3/0/7/130775257/a7075.pdf
    • http://nathanchizenreviews.com/uploads/1/3/0/5/130545128/3179b.pdf
    • https://rodimebeveluki.weebly.com/uploads/1/3/0/3/130379475/sugeruropejabam-jipiroxutiwan-dabodeburejusak-vuvuxi.pdf
    • http://teamthomason.net/uploads/1/3/0/3/130323761/geridasa.pdf
    • http://hatsukimiyata.com/uploads/1/3/0/4/130476024/gowufej.pdf
    • http://ndchair.com/uploads/1/3/0/7/130776273/130776273.html#questoes+sobre+poriferos+cnidarios

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000037a2.bin
878cbf3871e898bdd331127c9f43984d652ae271ade5ff97dcae897d98c4b064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37A2 1764 bytes
font_01_sfnt_off00004371.bin
b06ce640270415a74df955a17ee4d7ceab58f413a1584145d9249d45d80d369f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4371 10428 bytes

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