Malicious PDF — malware analysis report

Static analysis result for SHA-256 7466f2d4bb7c4658…

MALICIOUS

PDF

35.6 KB Created: 2020-08-29 03:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 182928609c031e310b06609732f7487e SHA-1: 6238c1bdc796591cbfd22193c6859c035aec0d8d SHA-256: 7466f2d4bb7c46587eaa292bb18af6ffd7ced3cb85ec6e42aeded2e258f41387
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious URL, disguised as a movie download. The document body and embedded links are part of a link farm designed to attract users with search terms. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=abcd+2+full+movie+hd+free+download+khatrimaza
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/movufuxawibap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/2579121880.pdf
    • https://cdn.shopify.com/s/files/1/0461/0503/4915/files/examples_of_journal_entry_template.pdf
    • https://static.usrfiles.com/ugd/b8c837_44a4da9fe85a43c3afbb0af00c129b8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cfdd0b7e7d74c2eb51e171d6d389418.pdf
    • https://static.usrfiles.com/ugd/b8c837_010506e8282e497f8c70d9024c0094db.pdf
    • https://cdn.shopify.com/s/files/1/0446/0806/1604/files/ihk_stuttgart_berichtsheft.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/tobedadedorevutiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/85404317393.pdf
    • https://cdn.shopify.com/s/files/1/0434/6557/2514/files/rekumobuko.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/bl_theraja_basic_electronics.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_off00004b0f.bin
a34bb9ab5d6695a2b6b88b45f481a815a98311207c8a0ee56fc7a8f56636cadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B0F 5612 bytes
font_01_sfnt_off00005e1a.bin
4afa218f668d47de422724c8628f01dc1deb52bef27e9aa793cd31728bd895b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1A 10336 bytes

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