Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f422d9e91db57e…

MALICIOUS

PDF

48.4 KB Created: 2020-08-30 07:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b1f4666b3d44c679364bbbd84947fe SHA-1: 2d1af013096beb0f197def9f874b1951ce711113 SHA-256: f8f422d9e91db57e75a1c27b330ed9a86f14081c0164b52d055d14307521ee8b
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'dragonhide armor 3.5' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.me/wix?keyword=dragonhide+armor+3.5
    • https://static.usrfiles.com/ugd/314c35_5209702556bc4eaea585ec27582b572f.pdf
    • https://static.usrfiles.com/ugd/38bf1f_c4bcd16ef6104b2bb6e7a2aff80e8829.pdf
    • https://static.usrfiles.com/ugd/3e87bf_eb8ab79a144f4aa286ed5c0302aabd06.pdf
    • https://static.usrfiles.com/ugd/b8c837_d558f7d8314a43f29fd41b87880bd9e2.pdf
    • https://static.usrfiles.com/ugd/d162e3_5fb201c880f5401e9c7af69977942365.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a42262263df4cbd8bf878a3eda5f33c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dadca1a3511476bbd9011da8b4af329.pdf
    • https://static.usrfiles.com/ugd/409ca8_313e1b08325f431d850438dd4888ee6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_31acf244f30c48d9ba84016a7ceea100.pdf
    • https://static.usrfiles.com/ugd/b8c837_4de5c01c304244a2830e8bc241186176.pdf
    • https://static.usrfiles.com/ugd/8b2c09_1cd637067f3e4e59b66e977e76b9347d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ab057cb3f5448f79db5af0863f7287d.pdf
    • https://static.usrfiles.com/ugd/d4da64_44bb0d6fdf894736aac6513b07c69059.pdf
    • https://static.usrfiles.com/ugd/bd5c68_58881af164ab4b42a732a75bbaf432ba.pdf
    • https://static.usrfiles.com/ugd/a59130_c147d25ecef54355a0b8277446d6932b.pdf
    • https://static.usrfiles.com/ugd/37321e_769439d99d6b4fb9a02820faa7ccc8a4.pdf
    • https://static.usrfiles.com/ugd/57c819_c12d266d98664c4fac27112d2d5242c4.pdf
    • https://static.usrfiles.com/ugd/33a16d_87ef9c17058349dba2f2b2ced853ade1.pdf
    • https://static.usrfiles.com/ugd/b8c837_603c1f8d26f5401094174002416790d5.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_off00007e65.bin
46101ad8e8ddbf48c924c99d2f6d95c89bc5903fa2f55d79c60e3a59827bbda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E65 5348 bytes
font_01_sfnt_off00009067.bin
3e1086cfaa7fc8b299e3ea7c93e05a4e3ee98499deadd4ea3a5095c292d1d076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9067 10576 bytes

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