Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fff8429759030f0…

MALICIOUS

PDF

42.0 KB Created: 2020-08-21 01:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5dcd2201846dcc335dd5ce54ec9aa0a SHA-1: bdcf682e4c1f3f75f40279b0e6b4f102bf615c23 SHA-256: 5fff8429759030f0992078648a495dc115e969af96923c3ae4b8ae64d36dc055
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=harlequin+romance+novel+submission+guidelines', is identified as a malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=harlequin+romance+novel+submission+guidelines
    • http://files.cieehsarc.com/uploads/1/3/2/6/132682787/85a6175421d2d4.pdf
    • http://files.schatziesevents.com/uploads/1/3/0/9/130969054/rolezuxinop-temat.pdf
    • http://files.daveclarkconsulting.com/uploads/1/3/0/8/130873715/duwovelurinenag_ruxezege_getopopepufo.pdf
    • http://files.worldscreenculture.tv/uploads/1/3/2/6/132695566/vanumoguw.pdf
    • http://files.4theloveofrocks.com/uploads/1/3/1/6/131606491/kesegi_widajokejuzeru_buwepariso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/ketawudisavejevikaretefas.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/57920784118.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/audra_simpson_mohawk_interruptus.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/structured_cabling_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/4802/6780/files/77517466815.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/45798390612.pdf
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/vakipodomamituladafakara.pdf
    • https://cdn.shopify.com/s/files/1/0465/0323/1646/files/anemia_microcitica_hipocromica_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0440/4055/2598/files/lanelabuxevewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/zavepuviwodu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ff.bin
5c32697a7f7293cb58680e7787d475d507fdb1b83414a8dab552e3221cd46aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 5544 bytes
font_01_sfnt_off000076bd.bin
10a88ba335cd92601c44ad158e132e2a618e34d2e6c39edb59f7b3a7d608e8c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BD 10760 bytes

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