Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c357de53e9f092…

MALICIOUS

PDF

33.1 KB Created: 2020-08-31 20:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00670e85eaa5eb703395b8168f52c39 SHA-1: 6f84332f78017e43c451b03c01e22d8ce25a9d30 SHA-256: 04c357de53e9f092c09f7cadb3179d600fbe8a8bec1c5f8fc8e91b19ce43899b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a 'Betfair sports tv guide' lure, intended to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=betfair+sports+tv+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/tenunijosajamiruz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9690/files/miss_universe_2018_winner_question_and_answer.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/saxixalexe.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05ce806e25141aa92bb4a89de07d8ea.pdf
    • https://static.usrfiles.com/ugd/04e6f9_f83ac2a57d2e43a6b4d3e5e5a9c7efad.pdf
    • https://static.usrfiles.com/ugd/b8c837_3aa93b80985740e29bbe2bed1a7f0aed.pdf
    • https://static.usrfiles.com/ugd/de65f7_bb566bd9cda64717a31956517002c556.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d6b61e60e3f448f8a4c378df59dd932.pdf
    • https://static.usrfiles.com/ugd/20d83a_713f66068bba4d2ba0d9b731be8ac82f.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_509058057c264c42b40dfbb358f8f52e.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004473.bin
6d36edcfcfa40dca796ae96c1bd1b415aa78ff058ab155e201184feb4b6779fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4473 5288 bytes
font_01_sfnt_off00005691.bin
05527d6cb84b46605487a299892f8e22d2ef2b85fd8bf879592987e9223dfa12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5691 10156 bytes

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