Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce625b0379f96fd…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 07:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53dcf36c2a9970c9c35d89ae40975637 SHA-1: ff8557a5d0b52ef4a0f406b4a6557a0dc48ae662 SHA-256: 6ce625b0379f96fd503f64b561d1acfaea3d2d4d85c933c02875e5de1f588fbd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document 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 URL, 'https://ttraff.ru/pify?keyword=general+aptitude+questions+pdf+free', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the same URL and other shopify links, reinforcing the lure.

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.ru/pify?keyword=general+aptitude+questions+pdf+free
    • http://files.medicareyourway.com/uploads/1/3/0/8/130874240/xemulerasitemebu.pdf
    • http://files.hvamusic.org/uploads/1/3/2/7/132712661/6d35c0f37.pdf
    • http://fuzetu.ababehavioursolutions.com/uploads/1/3/1/4/131437615/ee8b7fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/91223909948.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/wuxegupobobotuxepagi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/siluwikewazekes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/pebizemekeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/45677428973.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/pocetak_bune_na_dahije.pdf
    • https://cdn.shopify.com/s/files/1/0436/0873/5907/files/surah_al_mulk_dan_artinya.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/degradacion_ambiental_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/37573291991.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_off00005e8e.bin
f1f74df23c064c503ddc1a7b045117d596f035600045010bfb7ff2b108ef491b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8E 5192 bytes
font_01_sfnt_off00007046.bin
5ce0223a186c9327473e9da6bc13a82fdb76691e93e4c972429cb3010bffe938
pdf-font-stream PDF embedded font (sfnt) at offset 0x7046 14628 bytes