Malicious PDF — malware analysis report

Static analysis result for SHA-256 8994f6e84982f23c…

MALICIOUS

PDF

37.1 KB Created: 2020-10-30 19:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b9ca47f87273efac27a10332df4fb6 SHA-1: 190ae0641a11f51f354dcf726a1b2b1a781e9477 SHA-256: 8994f6e84982f23ca03c8f87a208f7e8aa71073af57c71e915e7623f9743de44
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and references to academic papers, suggesting a lure to trick users into clicking the link. 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://ggtraff.ru/123?keyword=chemistry+if8766+page+67
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f933336bd7bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0504/1949/9168/files/a_practical_guide_for_policy_analysis_free.pdf
    • https://s3.amazonaws.com/wonoti/46676817651.pdf
    • https://cdn.shopify.com/s/files/1/0507/2735/4528/files/descargar_whatsapp_para_blackberry_q10_apk.pdf
    • https://cdn.shopify.com/s/files/1/0499/2850/3464/files/wesafumokaxinivag.pdf
    • https://cdn.shopify.com/s/files/1/0499/3446/7224/files/download_aplikasi_gunship_strike_3d_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0465/1951/7334/files/ben_hill_griffin_iv.pdf
    • https://cdn.shopify.com/s/files/1/0507/9524/9832/files/45939629350.pdf
    • https://cdn.shopify.com/s/files/1/0439/8763/2286/files/bukunenor.pdf
    • https://cdn.shopify.com/s/files/1/0506/4327/1830/files/81649923549.pdf
    • https://cdn.shopify.com/s/files/1/0502/8190/6361/files/certified_paralegal_review_manual_4th_edition_free.pdf
    • https://s3.amazonaws.com/tadovu/sirefulexorevezov.pdf
    • https://uploads.strikinglycdn.com/files/a570aa26-4a13-4813-8bde-bb150c99f6af/vemevilosetugeriliwarotiv.pdf
    • https://cdn.shopify.com/s/files/1/0268/8493/1765/files/marineland_magnum_350_canister_filter_manual.pdf
    • https://uploads.strikinglycdn.com/files/e8819e9b-d88d-4bd0-b802-6170bce05503/footprints_without_feet_extra_questi.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_off00004fd2.bin
94b93d3edc02ba2daa2b5d26833dc5afa5d730c6a75232d1b1e5e83543927fc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD2 5716 bytes
font_01_sfnt_off0000632e.bin
f26d29009a8f303448e41b3e6fc9f7bac6af1e1ac4cba8e2d8a412d4e9f940f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 10736 bytes