Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e74f1a87704926…

MALICIOUS

PDF

48.0 KB Created: 2020-08-19 19:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a76b133878d7fab9f3b4c1b7db3a16f SHA-1: 0920a1956e556ee68427d5fb263009846a679d48 SHA-256: 81e74f1a877049263ed45de2241face319fa5b69d412e8c4d1b0d8d1798067ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a resume template, which redirects to a known malicious domain (ttraff.ru). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

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=theatre+resume+template+google+docs
    • http://files.hamlinhomes.com/uploads/1/3/1/4/131453241/sonutowowiwiv_jujebepixusijav_datasebone_tawujuzam.pdf
    • http://zuketi.renndrive.com/uploads/1/3/1/0/131071258/bowuxodox.pdf
    • http://files.parosclassicalpianofestival.org/uploads/1/3/0/9/130969051/285b8d.pdf
    • http://zajura.amythecrittersitter.com/uploads/1/3/0/7/130776737/nerusebudigen.pdf
    • http://safezov.ishtaryasin.com/uploads/1/3/0/8/130814328/72b8cade0bd968.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2236/6366/files/78111610021.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3527/files/77182529639.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6293/files/copleston_history_of_philosophy_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3011/files/electricity_little_alchemy.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1416/files/84996919004.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/new_bible_commentary.pdf
    • https://cdn.shopify.com/s/files/1/0448/3615/9645/files/pigusutakabafiwudaroni.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/reticular_formation_meaning_psych.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24803542318.pdf
    • https://cdn.shopify.com/s/files/1/0443/9543/0054/files/video_cinta_luar_biasa_lirik_cover.pdf
    • https://cdn.shopify.com/s/files/1/0440/9714/2936/files/bioremediation_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/minecraft_how_to_make_treated_wood.pdf
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/zakinavoworekunew.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/20690057039.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007506.bin
9fc8d8d80220587387c09cf50ac929aea3a6aa26e64b077030bd9a2efea3c14a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7506 5436 bytes
font_01_sfnt_off00008754.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8754 1800 bytes
font_02_sfnt_off00008fe1.bin
59ba66eb888224039090684807bf6972e361ef4e60fbcdb5bb5f3bfefc6ab786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE1 10084 bytes

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