Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad4541c88b141cd…

MALICIOUS

PDF

100.5 KB Created: 2020-08-09 15:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc128af02e72d18b18480d6f42edd927 SHA-1: cdfdccc3e5d514d25e72b8c3674af278155d920f SHA-256: 7ad4541c88b141cd120043c78fc8e7fe9709b93d1b312e03978e29b7220214de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as containing a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially harmful websites through these embedded links.

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=auto+tuning+pid+controller+pdf
    • http://files.autochekcenters.com/uploads/1/3/1/1/131163957/mafuzoreboxarovegika.pdf
    • http://files.drkirstensingler.com/uploads/1/3/1/8/131871390/dotujex.pdf
    • http://ragane.greenvillechoralsociety.com/uploads/1/3/0/8/130814328/waxadixefa.pdf
    • http://files.shibuecaribbean.com/uploads/1/3/0/8/130814666/fazulowe.pdf
    • http://pejogo.ajreilly.com/uploads/1/3/1/4/131453133/lorisuwi_luminesa_pexufosojuzaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/2129/2952/files/jungle_stalker_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/minecraft_stampylongnose_hunger_games.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/bnmu_part_3_result_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/openssl_ca_cert.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/zipitema.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwakuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/gulij.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/verudaguzubelukeruwupele.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/baton_rouge_television_listings.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/96219089639.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d88.bin
a039cb9dc2ba3842e927f2d1c84a58f63892474fde419d869427348b41217acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 4808 bytes
font_01_sfnt_off00012df0.bin
a0ce78e98b8d1d25283586cb2dc8ae0465ddcb33bdae8fd1dc7e641aa3f8e0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 16220 bytes
font_02_sfnt_off00016124.bin
e519f4e4ac6d9b0f57dce0c0d49b484e4d1d842646fa75230b4829220ba81c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16124 16140 bytes
font_03_sfnt_off0001761f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1761F 4324 bytes

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