Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b060c3055070938…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 03:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5f49f4ac7acff5db04506390d7aac73 SHA-1: fa5db2aab6e29448d8484be6b30f68bff333232b SHA-256: 4b060c305507093897233884aae4681db5bae89578fb027642f5a5550aed062a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is used to lure victims. It also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The document body, though partially corrupted, contains the phrase 'Vaillant fault finding guide', suggesting a pretext for the malicious link. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.cc/pify?keyword=vaillant+fault+finding+guide
    • http://files.gypsyjacksfashions.net/uploads/1/3/0/9/130969966/vananizubovize.pdf
    • http://files.albertomagana.com/uploads/1/3/1/8/131856279/8efcaf36b3df.pdf
    • http://mivop.elementaryethnicstudies.com/uploads/1/3/0/8/130874066/41f1cd6c.pdf
    • http://files.joellenfletcher.com/uploads/1/3/2/7/132740620/4593657.pdf
    • http://nasuvu.jbombasaro.com/uploads/1/3/2/6/132681490/52afdbbe.pdf
    • https://cdn.shopify.com/s/files/1/0452/5703/1842/files/naming_inorganic_compounds_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7555/files/90672837249.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/69907217179.pdf
    • https://cdn.shopify.com/s/files/1/0438/3303/2864/files/90737870049.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/sedakuselelaxop.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/91281821574.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/ffmpeg_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0440/0293/4942/files/joradozivemupusojodez.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/48096933637.pdf
    • https://cdn.shopify.com/s/files/1/0439/3356/5096/files/binirabebimev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075d6.bin
b321bdaa607723b2d58b84d1fdf0f5a526c2898eaba74424faa7063309f629c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D6 4764 bytes
font_01_sfnt_off0000861c.bin
6e007fea124b2fb1543658fbfc2364da8340edb30773e87008b3ce38fe407a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861C 10304 bytes

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