Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff8cd9551515c78…

MALICIOUS

PDF

65.7 KB Created: 2021-01-01 21:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b791e8fbbd55edfdf273625922ad00 SHA-1: 7674aad5423c01e721db66e2e9b7b6fd36178b42 SHA-256: 4ff8cd9551515c78d89f422c18c379350cd5be6fa6c4a1d35b677a4a84305171
154 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://gettraff.ru/strik?utm_term=can+you+escape+the+room+level+7'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=can+you+escape+the+room+level+7
    • https://cdn.sqhk.co/tajiwikiter/NOgigfN/hungry_piggy_carrot_level_20.pdf
    • https://cdn.sqhk.co/nurofiwele/ihBge4s/mutants_zombie_horror_movies_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ff2af7f3-380c-449a-9fc2-86fcb17fb362/alif_episode_13.pdf
    • https://uploads.strikinglycdn.com/files/15f750e1-3a91-4403-a495-ddca775596a7/mogiwef.pdf
    • https://s3.amazonaws.com/dofufiri/free_vpn_server_app_for_android.pdf
    • https://s3.amazonaws.com/rokuwapesu/types_of_icing_flavors.pdf
    • https://uploads.strikinglycdn.com/files/e9bd4ad5-35ac-4395-bc88-a62cf190b157/valig.pdf
    • https://s3.amazonaws.com/gomaxod/taiwan_visa_online_form.pdf
    • https://uploads.strikinglycdn.com/files/8a8d0970-632d-400f-83d9-6362c6cd3f28/king_for_a_day_pierce_the_veil.pdf
    • https://uploads.strikinglycdn.com/files/764e6292-8d9f-43b9-a941-7f02ac3239d4/sons_of_anarchy_patch_over_cast.pdf
    • https://uploads.strikinglycdn.com/files/5b3feec8-7d1f-49b7-9574-dd125d738135/nofuwed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba2f.bin
3b290e73ba2975128564022f07bf08c75f3ada27bf8f304414a9d51c951afbb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2F 5272 bytes
font_01_sfnt_off0000cc07.bin
5841ae061fdae83921f88e0d9ef30b63cffabf2ae0b1f5dacf5ed5e730b75b45
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 9412 bytes
font_02_sfnt_off0000ec44.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 4324 bytes