Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45184fb8d7c40da…

MALICIOUS

PDF

45.7 KB Authoring application: Nitro PDF
MD5: 9a4432b39112f1de28867fb056270dd6 SHA-1: 94927a88da65b325deec8b5190f5379228176413 SHA-256: a45184fb8d7c40daeaaa02c65ecb0326eb42a37f68ed6099ea87ddaf96148990
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The document body contains a large number of embedded external links, predominantly pointing to other PDF files hosted on various domains. This suggests a campaign to distribute malicious content or phishing lures through a link farm, likely to evade initial detection or to maximize reach. The ML classifier also strongly indicated maliciousness.

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://tribelicious.com/uploads/1/3/0/2/130270867/vigun-wuwiziwuwa-xirabujejuvedoj.pdf
    • http://olecabaret.com/uploads/1/3/0/5/130543980/pamijivuvazowe.pdf
    • http://nourishhealthservices.com/uploads/1/3/0/2/130289352/sedofa_samoxezufawad.pdf
    • http://arthvrian.net/uploads/1/3/0/2/130291784/taburuposiganor_bokizawa.pdf
    • http://mksports.ie/uploads/1/3/0/5/130590678/4717755.pdf
    • http://mondokdentalmexico.com/uploads/1/3/0/3/130313605/a1b870799.pdf
    • https://balobekar.weebly.com/uploads/1/3/0/3/130323173/f08dd2d753bc.pdf
    • http://synchrocentral.com/uploads/1/3/0/5/130589295/kupokobirezoxik-politufa.pdf
    • http://radiusmedgroup.com/uploads/1/3/0/6/130621376/teponemipu.pdf
    • https://xepuzepajokeku.weebly.com/uploads/1/3/0/6/130604319/ziweweris_fizokab_nusidi.pdf
    • http://caninecompanionkollege.com/uploads/1/3/0/6/130621055/7cc21440264b.pdf
    • http://neokundalini.org/uploads/1/3/0/6/130621701/130621701.html#russian+formalist+theory+slideshare

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001318.bin
4acbd68e532f7344df0b37bba22f27f15d4ae14a6d423255d13f169d6354a6e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1318 7956 bytes
font_01_sfnt_off000078f8.bin
2f6af4c8a350d9ef21591309ffbafe35f8a32bb2e7d843c3733ebbf34324dfb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F8 1784 bytes

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