Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dc5177539c2a0e…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 08:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 334f73e4727c29e3d2800c69385950ae SHA-1: d7e95f536d120c93558879b42a727f71a1d72c79 SHA-256: e9dc5177539c2a0e8bba4d68d866a099f32adfce07357c8581cf90c80259748a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a likely attempt to lure users to malicious infrastructure or manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link-based 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/wix?keyword=mcculloch+eager+beaver+chainsaw+manu
    • https://static.usrfiles.com/ugd/b8c837_2a84e3cf8b1843ffa0db26a71b05c1a8.pdf
    • https://static.usrfiles.com/ugd/efb3f0_f5ff5204b98d4fd794347e4b6c378968.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5ee22d5d4194382b5ba869f65d86ee1.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/20060229574.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/o_que_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/zen_budismo_e_psicanlise.pdf
    • https://cdn.shopify.com/s/files/1/0434/7671/3637/files/leviwobivogifizan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/23702509215.pdf
    • https://static.usrfiles.com/ugd/eb4c03_c99a4cff94a8460b8a0391dc36616223.pdf
    • https://static.usrfiles.com/ugd/5e8de6_ae41c05628834b95b59d9987ac899a01.pdf
    • https://static.usrfiles.com/ugd/21e6f2_c9739306fbfd40a382f635ad27a67c44.pdf
    • https://static.usrfiles.com/ugd/8cbfce_19acd7760edc4fc3ad77e0e76c81c59c.pdf
    • https://static.usrfiles.com/ugd/6290de_ba175bcf25c748829ecba0f98a7b12e3.pdf
    • https://static.usrfiles.com/ugd/e33828_ccb72cd9f941404786798703922cd547.pdf
    • https://static.usrfiles.com/ugd/b8c837_341c009ad4dc49fa968a60bcb5cf96e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_770bf3c3d14943f8bd9de74929a16c86.pdf
    • https://static.usrfiles.com/ugd/83d902_ff26f5439a3244fb9a8ae9de62f306f5.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_off00006dc8.bin
de968dc68105bdcfb9b1aebc49e9a6d02d65e28ef555fb3919bb92559dbb60bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC8 5508 bytes
font_01_sfnt_off00008079.bin
f2fc2ce9587c9a4339ff921514ecac961e149bde577fcd77e91dd7e1a07bb877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8079 10248 bytes

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