Malicious PDF — malware analysis report

Static analysis result for SHA-256 685f88789cad4734…

MALICIOUS

PDF

42.4 KB Created: 2020-10-29 22:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5ef2b763c52d5b7671fc8ec8672f385 SHA-1: 5b9536cdba1e2ff2e3ada0bc9afe18f9ff47e3f1 SHA-256: 685f88789cad4734528de869f0de3809389e623bf0dd26f44349ce710234f161
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.club/123?keyword=how+to+rip+models+from+games
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f8d4dc9bdd91.pdf
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f8b793cc5804.pdf
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f895c9c23251.pdf
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/81fc7.pdf
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/bagar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1b318fd5-7230-4975-b4e3-73ed52b6bca8/31263877534.pdf
    • https://uploads.strikinglycdn.com/files/4a16552d-13c8-43a1-9013-49d9073cb487/19690182181.pdf
    • https://uploads.strikinglycdn.com/files/2f3df910-0b71-4490-9403-f6c7ef9cdd2d/gilofexejunowa.pdf
    • https://uploads.strikinglycdn.com/files/3775f6a8-6697-480b-b80b-f06da0b26cd5/70998030516.pdf
    • https://uploads.strikinglycdn.com/files/cb99ddc2-ee6d-4c5c-acab-925f47557f90/xigepivoxegitut.pdf
    • https://uploads.strikinglycdn.com/files/757f632c-75d6-47c5-911d-abb86b37a6cc/book_of_vile_darkness_3.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_off000068a0.bin
44b553de5ab3bbcffbb5d2ba69152afbca444060a964eb027f818bdb31680546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A0 5416 bytes
font_01_sfnt_off00007b02.bin
b429ba711f703226f63e99d06a495637ca618a915ec848e43655e499f18d9a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B02 9996 bytes

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