Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8651871c624031…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 22:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c870ec8e4bae05af47bdcd617dca6012 SHA-1: a40efca7c390ac96f9fce1e07f74cca0718c9c4e SHA-256: 0a8651871c624031a2f7e2e6987c7e68f37200a897402945f6cc5184e1a572f1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=ash+gray+gba+emulator'. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the presence of a malicious URL within the document body indicates an attempt to lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=ash+gray+gba+emulator
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/9700/2918/files/struct_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0459/3126/6215/files/23115550134.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6966/files/tefutafu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5029/5708/files/zixejuxa.pdf
    • https://static.usrfiles.com/ugd/b85eb0_353f09b9e50944e8bd77d7a760e73639.pdf
    • https://static.usrfiles.com/ugd/08fe48_fadc8ca35388456daeec2648f6f39ac5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.pdf
    • https://static.usrfiles.com/ugd/c0b427_c720ff986d8f40b78f3d684c3955d311.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_off0000538c.bin
8143f158c855f01245042b7bef17b36496e04fca830c6127b4f16fe0c09b1f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x538C 5328 bytes
font_01_sfnt_off00006592.bin
d0ff86f2ac889538b31edc089be079bdad219f676f143e4c744e6c69cd41b41e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 10964 bytes

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