Malicious PDF — malware analysis report

Static analysis result for SHA-256 142a931c2025b1bc…

MALICIOUS

PDF

41.9 KB Created: 2020-08-27 14:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12561abaa9a9736a9d5d6f11737e48d2 SHA-1: 334c7a7637b5d8004ecf034d4f7972a502765e40 SHA-256: 142a931c2025b1bcef2b0c4de29ced86c3521d2073d2e87b3a0a7271a4566a04
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=2005+jeep+grand+cherokee+factory+service+manual`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to download further content. The presence of numerous external PDF links, many pointing to benign Shopify domains, indicates a potential link farm or SEO manipulation tactic to obscure the malicious redirector. 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=2005+jeep+grand+cherokee+factory+service+manual
    • http://ledomojun.powersourcedubai.com/uploads/1/3/0/8/130813714/lifelonug-palobatumonarad-narerogat.pdf
    • http://gesugofud.jeffbeckpersonaltraining.com/uploads/1/3/1/8/131857120/zimabigu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/38066934625.pdf
    • https://cdn.shopify.com/s/files/1/0433/6916/9054/files/coriolis_effect_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0460/7465/8980/files/falciform_ligament_sign_radiology.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/94820385835.pdf
    • https://cdn.shopify.com/s/files/1/0433/3489/3718/files/possessivartikel_dativ.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/99715804077.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/kolkata_map_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/bach_little_prelude_in_c_major.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/kuzilabitumisizerelewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6473/files/cefr_framework.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5240/files/android_emulator_visual_studio_2015_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0449/8564/7272/files/gitamiki.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/the_rise_of_nationalism_in_europe_notes_download.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_off000061f9.bin
385d971a9b03871733b02d020eea957275de296400870d522f7f559fcc37c4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 6172 bytes
font_01_sfnt_off000076dc.bin
005e6d060eafa22f2f5f8e0db451434966412ede749780fb628a81b6e2d220c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DC 10420 bytes

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