Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ba05a3ec4eba84…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 08:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44b83e4103474d52f828443e498d0218 SHA-1: c9280e8c0a791ccb88731cb376e4ad9b02bf44f8 SHA-256: 72ba05a3ec4eba840b9476591a8013bf909a1d725f9bdc4da97f0cbfb9758fff
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a "birthday invitation templates free psd" that redirects to the malicious URL https://ttraff.ru/wix. This URL is flagged as a known malicious redirector. The document also contains a large number of links, many of which point to PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates 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=birthday+invitation+templates+free++psd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/salesforce_admin_maintenance_exam_spring_19_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/docker_linux_mint.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5447/files/viginozo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/github_markdown_to.pdf
    • https://cdn.shopify.com/s/files/1/0459/0433/0906/files/fire_basics_review_crossword_answer_key.pdf
    • https://static.usrfiles.com/ugd/badafb_a95fb25292e94c95a6a0908b92698bec.pdf
    • https://static.usrfiles.com/ugd/0047a4_bd151806b4584c0ab652001e5a1f99b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_30bda6cbade347fe9b4b4577d96426f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0019bec7fe5d4706b2cf7941c50487ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://static.usrfiles.com/ugd/b8c837_749827de5268404b836fd0d1bf8d7952.pdf
    • https://static.usrfiles.com/ugd/accd1f_238fe2c795e64b48baa5d4ff625dc7e9.pdf
    • https://static.usrfiles.com/ugd/cfa91a_716ddf074abe4deb83071b3216d0d79e.pdf
    • https://cdn.shopify.com/s/files/1/0432/6398/3769/files/21463925429.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/95359731086.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_off00006d8e.bin
89f32df3d9155dbfa11a74b2f72d7f70bb7c1941a34bdbba92903fce3d598e18
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8E 5492 bytes
font_01_sfnt_off0000801c.bin
23760cf7a52ac635fa5690c4d64bfc0feccc73786b3b47b03a9afd0d96857e9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x801C 10960 bytes