Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f98803e085e384c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-18 15:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dee7a1cc44c75319259734a4b2bbd32 SHA-1: 9c57bd8a27efc5b1e1bbb648252c2db1e5c505d0 SHA-256: 6f98803e085e384cd491793cf2b35771482e3936d7c027a024fc9174b1938d29
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to link farms hosted on Shopify and other domains. One critical heuristic identified a link to known malicious redirector infrastructure at `ttraff.ru`. The document body, though heavily obfuscated, contains text related to movie downloads and the authoring application, suggesting a lure to potentially malicious content. The ML classifier 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.ru/pify?keyword=bagnomaria+1999+full+movie
    • http://files.cappsmd.com/uploads/1/3/1/4/131482819/ruwiwirimeda.pdf
    • http://files.icome2you.com/uploads/1/3/1/3/131378993/f66a2fd1e49f5d.pdf
    • http://tijit.theafroronin.com/uploads/1/3/0/8/130874104/wabena_redeg_juwabif.pdf
    • http://boziv.foreseeingprimate.com/uploads/1/3/2/6/132681337/bogukokowif_xujufadab_perowaxasitib.pdf
    • http://files.perthimage.com/uploads/1/3/1/0/131070754/4309018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/xujerusevixivewulisipit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/comparing_and_contrasting_worksheets_for_1st_grade.pdf
    • https://cdn.shopify.com/s/files/1/0440/5306/9974/files/search_inside_yourself.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/45331462933.pdf
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/amtrak_hiawatha_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/70030696202.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/18809588797.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/87199673171.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5318/files/bexekisodab.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/45021087366.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/nomenclatura_quimica_inorganica_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/basic_c_programs_for_practice.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/bafinimovulanitavex.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_off00006426.bin
553914bb0743cc62a74c19e8354771b48a46b793d191b7bccade7c10991d72da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6426 5224 bytes
font_01_sfnt_off000075e3.bin
0aec885e70a18f320abd7685f6029c335c08c89ee64e5c4988c74bed67ecdd0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E3 13304 bytes

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