Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c499e79218b8681…

MALICIOUS

PDF

70.2 KB Created: 2020-11-20 10:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e76294eb001e4a8981e970190cb715d SHA-1: 76e05fca7ca901622fc34117667ff3fea6d67200 SHA-256: 5c499e79218b8681085e7252215be9aa155af8ea4cc374636d2e34ee1108cd57
254 Risk Score

Malware Insights

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

This PDF document contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?utm_term=dream+cafe+rue+des+martyrs'. The document also exhibits characteristics of a remote-support tool lure, instructing the user to interact with such tools, which is high-risk in an unsolicited context. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=dream+cafe+rue+des+martyrs
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f9284f59ea1e.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdf
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f876b66821d3.pdf
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/zubopaparek-zuwitanew-xobezedodi-vokinewimal.pdf
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5fa97d8298126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dejolavubukugeb/88225325392.pdf
    • https://s3.amazonaws.com/rerinago/zerker_guide_osrs.pdf
    • https://uploads.strikinglycdn.com/files/587f282e-8b60-43ef-91cc-15942ced40dd/46894523151.pdf
    • https://s3.amazonaws.com/vufuzewasi/runeseduxogegejokuni.pdf
    • https://s3.amazonaws.com/xezonijida/13387760337.pdf
    • https://s3.amazonaws.com/jotizifime/lennox_pulse_furnace_history.pdf
    • https://s3.amazonaws.com/xesigeze/xoruxekizesipovupofiv.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_off0000c8f2.bin
ca679348c0980cf8f927e9b5551967791cac0803df9fcfe0a3538b78b31fd2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 5236 bytes
font_01_sfnt_off0000dab0.bin
0f0ed770d3db98d93b74b9621c7aa73924cd6c5630607688f8ebab9d2ec3a78e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 2452 bytes
font_02_sfnt_off0000e568.bin
9dc1216e6bea9f9184385c47f8a7832b7f547f176a20fa793edb33cb0148d2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 10932 bytes

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