Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1f78effd2ac0a3…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 08:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65af4cdf656008257689591dfa0688f6 SHA-1: 4aeb9392e38d423a60794207a8b18a2fc5a3d78b SHA-256: 0e1f78effd2ac0a364e13058ecbc6021af5fe6ddffdb03877e729937e7030adb
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and keywords related to accounting principles, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links, many pointing to benign Shopify domains but some to unknown domains, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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=accounting+principles+and+procedures+book+pdf
    • http://wobivuzi.igettremotesensing.org/uploads/1/3/0/8/130873851/2626581.pdf
    • http://files.nhsnpa.org/uploads/1/3/1/6/131606035/popakevilena.pdf
    • http://bizulo.globalgemology.com/uploads/1/3/1/6/131637419/d0b45.pdf
    • http://zimuves.justcreativejulia.co.uk/uploads/1/3/0/8/130874493/senos-guvolebaxube-badisojoli-lopifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/lds_baptism_program_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/equilibrio_acido_base_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/factorio_train_blueprint_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/psicologia_morris.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/xanuduzosivixavosisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/purovipixalas.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/vajafik.pdf
    • https://cdn.shopify.com/s/files/1/0431/4516/7008/files/static_budget_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/69882614229.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/nekilirorebogupijunidej.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/64423870152.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/hindu_baby_girl_names_in_telugu.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_off00005f4d.bin
4c04398a084f46e548b30df89de2d72f8e83ce6e0daa4e61c534c12a82341871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 5516 bytes
font_01_sfnt_off00007217.bin
41aa022097429e811de5e34e95337cf7eb7d097b7add6aee3e5f5be961ea9706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 10576 bytes

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