Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f1bb444621cb36…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 08:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdfc440c16ee90fdd7b9a7cd60e189b6 SHA-1: 42d887d855b3b128aac208385d19ea8287e1c941 SHA-256: a9f1bb444621cb36155e71ad125685b0c01dd9eac73b24634806f0ad49491d3f
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains text related to 'Baby driver pelicula completa en español' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely for SEO manipulation or to obscure the primary malicious destination.

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.club/wix?keyword=baby+driver+pelicula+completa+en+espa%2525C3%2525B1ol
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/87295666582.pdf
    • https://cdn.shopify.com/s/files/1/0430/1484/8671/files/bodybuilding_workout_plan_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8477/files/alliteration_assonance_consonance_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/pharmacology_ebooks_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22893269325.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93016620893.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/king_of_avalon_hack.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9625/files/vawexudo.pdf
    • https://static.usrfiles.com/ugd/b8c837_79f7511c81a6460597ceabda20b33dc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_db9b540fbbe147f8a512187bec583164.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://static.usrfiles.com/ugd/12f4eb_c65ceff755d442cf81701c5b8d996a3b.pdf
    • https://static.usrfiles.com/ugd/0047a4_f39153c0e5604a21a3d8c12585680f1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9fc9dad33904a0e83b75a1cc6751ed4.pdf
    • https://static.usrfiles.com/ugd/5ad03d_49549933802c48db858cc4f0cfc7a022.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_off00005932.bin
3795545e9a4d682918f2d2e9d70045fbea1d914f86b34187d6e13ae2f7c6ef96
pdf-font-stream PDF embedded font (sfnt) at offset 0x5932 5784 bytes
font_01_sfnt_off00006c7e.bin
662e9dc63b8350caad3b5dd7044001df03e31f2739995bce0b4f5b6e0ade21c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7E 10496 bytes