Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a226f9befd3e2a3…

MALICIOUS

PDF

40.5 KB Authoring application: Nitro PDF
MD5: 5f7d328484af373b957889ee084c17f2 SHA-1: 46d9c62ca51ef8e0253ffd76b81fc611b674fe85 SHA-256: 7a226f9befd3e2a35d2a7201e9bb54c4f0ec09aa55f3521389c4d60c3ed51212
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule and ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0. The document body contains numerous embedded URLs that appear to be part of a link farm, suggesting a phishing or SEO poisoning attack. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics point towards a malicious intent to redirect users.

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://blubloggs.com/uploads/1/3/0/6/130621225/1891784.pdf
    • http://duzutot.osada.fun/uploads/2020/01/28/544f3f99b.pdf
    • http://alimosphere.com/uploads/1/3/0/5/130545327/deaf8babf1daa6.pdf
    • http://aldhikraph.org/uploads/1/3/0/6/130640218/3354562.pdf
    • https://busufovemawut.weebly.com/uploads/1/3/0/4/130483184/fezosofutawejo-boxuvujokazax-zomulosomimexav.pdf
    • http://astridbadell.com/uploads/1/3/0/4/130483136/kawuwewabetusu_wilegubumuv_dukumi_gejemojenu.pdf
    • http://tofabamo.populair-cyber.com/uploads/2020/01/29/lejularazu_jigadimomoro_dasilul.pdf
    • http://anchoredhomedesigns.com/uploads/1/3/0/6/130639404/mogokoxajevuta.pdf
    • http://beingdance.com/uploads/1/3/0/7/130738835/130738835.html#wacom+vs+topaz

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000121f.bin
cdf60a552453652576bc40e01de9c24c600d7d03ce552150f02dca9343c38b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F 8332 bytes

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