Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81b44f1959fa9ef…

MALICIOUS

PDF

45.0 KB Created: 2020-08-08 08:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe4f572b5d5769770d6dc3a88332802 SHA-1: 0cfffc7b42f62c1790c7c1add0974a38295ebd72 SHA-256: b81b44f1959fa9efa80fc79f035f19bd3f12572b986f50b5dd14f0115db27461
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to a harmful site, likely for phishing or malware delivery.

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.cc/pify?keyword=empire+byzantin+et+carolingien+5%25C3%25A8me+pdf
    • http://files.endurancepilatesandyoga.com/uploads/1/3/1/6/131606953/sasijumex.pdf
    • http://files.perinatalstemcells.com/uploads/1/3/1/0/131070651/zitixarodid-xoxisagugoju.pdf
    • http://files.filterubco.ca/uploads/1/3/1/8/131871424/julederatejos_lefefupuso_divunilaka.pdf
    • http://files.learningsupport.shenfieldlearning.com/uploads/1/3/0/8/130874026/terif.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/95667014409.pdf
    • https://cdn.shopify.com/s/files/1/0443/9290/6918/files/bgp_routing_protocol_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0444/2944/3238/files/how_to_use_one_touch_ultra_mini.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/tumumenimeluvozipejufite.pdf
    • https://cdn.shopify.com/s/files/1/0437/3810/3962/files/60962466045.pdf
    • https://cdn.shopify.com/s/files/1/0449/7453/8920/files/jahiem_the_makings_of_a_man.pdf
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/the_hobbit_strategy_battle_game_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/7936267367.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/64918143756.pdf
    • https://cdn.shopify.com/s/files/1/0432/7633/7318/files/vofeveniwagaratuwewugeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/fisioterapia_cancer_de_pulmo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/96120471219.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/68440234156.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/alien_races_book.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c0f.bin
268859da25360ab76b710b061d5cc4af3b2411e1fef679b5c6b8fc8dd103323f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0F 5812 bytes
font_01_sfnt_off00007f8e.bin
584f53a5b549b0165058cd8d80fe34717810de90936890875cba6db7a6aaf173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8E 11848 bytes

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