Malicious PDF — malware analysis report

Static analysis result for SHA-256 5272decff16ccf05…

MALICIOUS

PDF

38.1 KB Created: 2020-08-29 21:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f600d74af47dc6adcb97a6690ddd54c5 SHA-1: 14f661111ad6fd8095a8cbd1bf2ee71e5dad5703 SHA-256: 5272decff16ccf05d695ae2b23cab8b067fcd99d0e8b2f514813245078e9591a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body text, though garbled, includes the same suspicious URL found in the redirector heuristic. The presence of a link farm suggests an attempt to obscure the final malicious destination. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

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=my+rotten+redheaded+older+brother
    • https://static.usrfiles.com/ugd/b8c837_21b9ebe27ef7402f87e0d0f199e9f391.pdf
    • https://static.usrfiles.com/ugd/b8c837_be9f28fe57fe4203af86192898d17ca9.pdf
    • https://static.usrfiles.com/ugd/b8c837_13617de06801418a897d3230cd82862e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a90dd225c32e41e8af431106ff17fda3.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/sondaje_vesical_masculino.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1edcb8a83c94dfea2c829b95e17ac54.pdf
    • https://static.usrfiles.com/ugd/10e3af_6044710b033f440c8bd9284d1f56b75e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa6b8dff86a4d399fb9527455677dd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_407fb36b545b451db726156f0a55eebe.pdf
    • https://static.usrfiles.com/ugd/b8c837_312504d1cf2d44fcb4f3b3d8e2ce6d74.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_off0000591f.bin
7ba96dc86e4649c62058b4ff422d6af9a783466f168e2dc7bf8497bbee44cbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591F 4980 bytes
font_01_sfnt_off00006a0a.bin
749f427faff0e7b13fa713c8b3ecb1391470d9d3144648fb36a4c46e6e1b0afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0A 9960 bytes

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