Malicious PDF — malware analysis report

Static analysis result for SHA-256 28216c0019a3fe2f…

MALICIOUS

PDF

50.5 KB Created: 2020-08-16 22:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d29f245ee18501a68c9216932bb03256 SHA-1: c45eed18e320e7022f61aa0740ce9b8ccb6c4fba SHA-256: 28216c0019a3fe2fa53d79831d4a0ffa877be5cb0b97ee21d6139db83449e777
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a mass external PDF link farm, with many links pointing to Shopify domains, likely to improve search engine ranking for malicious lures. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bushnell+prime+rangefinder+manual, which is designed to redirect users to further malicious content. No scripts were extracted, but the PDF structure itself is used for the malicious redirection.

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=bushnell+prime+rangefinder+manual
    • http://katafi.bridgestoserbia.com/uploads/1/3/1/0/131071021/rokeworaxusipominaga.pdf
    • http://kudasal.piratechaseracefest.com/uploads/1/3/0/7/130775413/fumipirawe.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/dijavu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/www._craigslist_baton_rouge.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/98767412830.pdf
    • https://cdn.shopify.com/s/files/1/0435/6361/4369/files/91202262887.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/mododeritexepatebawujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7590/3383/files/clinical_microbiology_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/ripowakazaxapewi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4788/4699/files/tactics_for_listening_oxford.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/culture_of_animal_cells_r._ian_freshney.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/72876956978.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/fuxezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/gekadinetiwuva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c1.bin
760186cc6d02f4ebde50e4fe1165d53df8d1d275a8d0cf355ce8a47ac56e25d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C1 5504 bytes
font_01_sfnt_off00008a3d.bin
886f5cef11e37944b1fdb6248000e14c245d0bf26bcaf2f10a2a92c3960c7e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3D 1960 bytes
font_02_sfnt_off00009344.bin
ffb43604ca75fc66c3e1acb3b731165188948a3d8f7a1b1d3c8aa10bfae43dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9344 12680 bytes

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