Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cb6c3c09752a21…

MALICIOUS

PDF

50.9 KB Created: 2020-11-05 08:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea7384975cb3bca61d75245da4a4bb8d SHA-1: bda1f95bb22cb8e88ce20d7103777b5a3bdba518 SHA-256: 11cb6c3c09752a21ac95131cf0483623809b37152c64e342319ad8754a414f43
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=word+for+run+away'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the redirector suggest an attempt to lure the user to a malicious site, likely for phishing or malware delivery.

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://ggtraff.ru/strik?keyword=word+for+run+away
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/571dc11fd97.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8b0377af014.pdf
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/9320316.pdf
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f8b3928c2b24.pdf
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/b8603ab1d10485f.pdf
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5f9edb5b2f690.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sukobogixe/last_day_on_earth_generator_at_tower.pdf
    • https://cdn.shopify.com/s/files/1/0482/7863/4651/files/particle_motion_calculus.pdf
    • https://uploads.strikinglycdn.com/files/92b21117-639b-4387-b7e1-41da1b724d87/summary_the_storm_by_kate_chopin.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009be7.bin
ffb1f0c039bed76e68dab7de4abf07a82c00526a132c8f50d847841ae7e9fa2e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9BE7 20988 bytes
font_00_sfnt_off00006594.bin
e626789a8be5d72683f59e76fbd65dda1387380a0a9cba08fbd639ddb0123232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6594 4900 bytes
font_01_sfnt_off0000766e.bin
f0c858fc2ecfe0943312ce91117517d1884488458f32a3a7d55a1003d599f733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766E 10904 bytes

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