Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88f29a8b6d693e7…

MALICIOUS

PDF

58.2 KB Created: 2020-08-22 22:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d9d16d6cc1fa47ad1a7881866eaa1af SHA-1: 6662ae6e635ec96d60608c92bb73a618bba88cc6 SHA-256: e88f29a8b6d693e7b4899d76a11d72c2df06f47b8113eb216aec4d50a1429a47
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on various domains, creating a link farm. One prominent link, disguised as interview questions, redirects to a known malicious URL (ttraff.ru). The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves social engineering through a deceptive link.

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.ru/pify?keyword=behavioural+interview+questions+and+answers+for+testers
    • http://tegotuxin.martinezria.com/uploads/1/3/2/7/132740328/vataronozibulalomef.pdf
    • http://depit.roundmotor.com/uploads/1/3/1/3/131383388/4538279.pdf
    • http://files.destinationpod.co.uk/uploads/1/3/1/4/131406744/153928.pdf
    • http://files.theblackthornorphans.com/uploads/1/3/1/1/131164260/156a98b.pdf
    • http://files.pennridgeteched.com/uploads/1/3/0/9/130969826/zebidemazut_guguvixuvuloji_sebaw_vozujebufotano.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/gipolijaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/66614154930.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/wozuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/koginexatekejatedemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/bafupuxizovele.pdf
    • https://cdn.shopify.com/s/files/1/0431/8219/4852/files/41575416702.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/27329260670.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/77770940614.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/66741825591.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/kapejifugerapewit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1964/0738/files/kimojesesufulize.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_off0000a52a.bin
b55baf923a9ed0e6de9b49a20f749e388801c38d48bce72ed68ee22f23fd680f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA52A 5324 bytes
font_01_sfnt_off0000b751.bin
374db66177f33c0125359159ab952f4b0439283725ae044879eb90f0e72b1468		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 10444 bytes

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