Malicious PDF — malware analysis report

Static analysis result for SHA-256 751f9073a53480b7…

MALICIOUS

PDF

67.1 KB Created: 2020-12-22 23:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd9c25114bff60401c89e7a1a67fd99d SHA-1: 1f19074910c3161325fd500209f67af84b9e72be SHA-256: 751f9073a53480b7c259f0f56a9f150513b61ab01e21cb797fcb517004f9d2a7
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm with numerous external links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The ML classifier also strongly flagged this PDF as malicious, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?utm_term=pinball+slot+machine+high+limit
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f95816432696.pdf
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f89ccfb87200.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f89db28036c7.pdf
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f956e2261351.pdf
    • https://cdn-cms.f-static.net/uploads/4463791/normal_5fa628fe456a9.pdf
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fdba461daf21.pdf
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fc87c500330c.pdf
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/34addb1b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d04dc1da-ee0e-4c36-9d49-3d76f4543f66/35589612832.pdf
    • https://uploads.strikinglycdn.com/files/f46c56e0-be53-402a-b175-d2de2f55956c/all_factors_of_3000.pdf
    • https://uploads.strikinglycdn.com/files/75996ef8-8608-48d9-af79-42941cbca92c/space_invaders_free.pdf
    • https://uploads.strikinglycdn.com/files/5262fa0a-1a80-4f0c-ae5c-7db704725539/koxobuwukiwuped.pdf
    • https://uploads.strikinglycdn.com/files/36844f0c-6bfd-4cfd-b18d-8f105c23931b/29176275819.pdf
    • https://uploads.strikinglycdn.com/files/ecdbf0a3-82bf-46ce-b2e2-aedc60bda6e3/sans_boss_fight_song_1_hour.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_off0000c958.bin
3a8acdc9d7aeae60a6e75a5e358c1f63912dd3caf975b00141288db092636ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 5260 bytes
font_01_sfnt_off0000db13.bin
92ed11950b632e04705f806282ff17af9c61a4543223f36b6d273a489990d7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 10808 bytes

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