Malicious PDF — malware analysis report

Static analysis result for SHA-256 55788478b727469b…

MALICIOUS

PDF

41.0 KB Created: 2020-09-04 00:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f108a429686fa034f30baf46bd339206 SHA-1: 8493bed69282cdb624cd94d3bf91006345c646bc SHA-256: 55788478b727469bc0758d343df0c8215555c8bbdd1ef4c04561f37f620586e4
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains the URL that triggered the malicious redirector heuristic. The primary attack pattern appears to be a link farm or SEO manipulation, potentially leading to malicious content.

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=benefits+of+ecotourism+pdf
    • https://static.usrfiles.com/ugd/7198c1_aa79a36b76554b32b3fac7991c0b2cb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eff75ab89544472add42aa72c8f1902.pdf
    • https://static.usrfiles.com/ugd/4479ed_e61b7cdfbf804c4b88d9b217457c5dc4.pdf
    • https://static.usrfiles.com/ugd/d3758e_c415c427a903436884ce388fc151756f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c45a3521adb48139282e4aac115287d.pdf
    • https://static.usrfiles.com/ugd/c63dba_398b76e051a74447b87df5447ef03433.pdf
    • https://static.usrfiles.com/ugd/4cf28d_6ad975e7f9c845ffa40da59df713a9cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e92f99d0184713afe8be59e0e5d453.pdf
    • https://static.usrfiles.com/ugd/a2d007_634b55f8026b4964a8e69e6dcf2bfad5.pdf
    • https://static.usrfiles.com/ugd/e745be_010463015feb4c59aa4c97d5ca7b1d7b.pdf
    • https://static.usrfiles.com/ugd/964009_1e6a06546b504256b5dac3b37a04534f.pdf
    • https://static.usrfiles.com/ugd/b914b5_892f22ba72bb47a08b2460211daaa598.pdf
    • https://static.usrfiles.com/ugd/96768c_eacd9e48c23047e0b234717e1a5a5952.pdf
    • https://static.usrfiles.com/ugd/efc97f_04c50feae86b4c848b40e3a9bd07cc0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b666f057f9024753a974a981014e7577.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecca9774b4e14120a00f63ae7b267244.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb47b5f1d4014dbdb96ac6e2fda0fb45.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_off00006442.bin
8100c36597fdb8c89030224cc7dc7abbaea5b22d7db75aa3189f1541519eabbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 5108 bytes
font_01_sfnt_off00007592.bin
8b20f3c64573daf3119601a740ccd3ba310bf7d8d6fc83798fc30d4791eacd93
pdf-font-stream PDF embedded font (sfnt) at offset 0x7592 9792 bytes