Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf08481cd0d91c9…

MALICIOUS

PDF

48.5 KB Created: 2020-08-12 22:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aed8e4e79fb1a57dbd1cd853ac3707b8 SHA-1: a558a1a9e1dff0a6aa8fd1312ba477db5cbe8b86 SHA-256: 2cf08481cd0d91c9de84ccb663a8f00887057cfe3637afb3f0048e109a335a6e
150 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, designed to appear as legitimate research papers. One critical heuristic firing indicates a direct link to a known malicious redirector, ttraff.ru, which is likely the ultimate destination for the attack. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=regression+analysis+in+data+mining+pdf
    • http://files.quikartist.com/uploads/1/3/0/8/130814475/77db55ef5d.pdf
    • http://files.nursinghomepj.com/uploads/1/3/1/4/131437750/rupipo_vemudejuxugivoj_nofomabib.pdf
    • http://files.nddistrictyouth.org.uk/uploads/1/3/1/4/131438460/af55d6.pdf
    • http://files.simplicitylavenderfarm.com/uploads/1/3/1/6/131636843/toseteviwadit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/gexapunokekokifeparesuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0437/6074/6648/files/msc_orchestra_deck_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7204/4697/files/cambridge_companion_to_liberation_theology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/muforamuna.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3301/files/23333696869.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/gejipifakovudususemel.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/87569725695.pdf
    • https://cdn.shopify.com/s/files/1/0435/7265/8335/files/pezatimob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071d3.bin
0616ec7d43acbccef7dfb07de6f2d89564484eb3bcfce382741344b7c6db7666
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D3 5260 bytes
font_01_sfnt_off000083a9.bin
e2dba45c168419bca53bff1857a2c239d45e91c1ecac8fc37a2c803fba64fbd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x83A9 10360 bytes
font_02_sfnt_off0000a716.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA716 4324 bytes