Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42c94538a361e76…

MALICIOUS

PDF

78.2 KB Created: 2020-12-25 23:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0609d1957dcb5ac8c4db0eddf6568f01 SHA-1: bafd83d3e8df46f1a20274cea85d47119d2691e5 SHA-256: c42c94538a361e762a1272d89fd91adb0ec50e1bec03a62ffe676814232f9b63
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document also employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This combination strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/aws?utm_term=million+dreams+piano+sheet+music+for+beginners
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f9af20028522.pdf
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5fcef7441af6a.pdf
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/5474497b3f4.pdf
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8c0a13615bc.pdf
    • https://gixisinada.weebly.com/uploads/1/3/0/8/130814349/femopuxujasotax.pdf
    • https://cdn.sqhk.co/risevejuxik/RFTHRcD/odd_man_rush_rating.pdf
    • https://cdn.sqhk.co/bifugudawesu/Zjgo3Eq/cold_war_beta_end_date_xbox.pdf
    • https://cdn.sqhk.co/munenetifu/e0ialG3/95188164200.pdf
    • https://cdn.sqhk.co/goremujoz/JNjhiho/zosalub.pdf
    • https://cdn.sqhk.co/sijoputolu/5ichfGv/32733760917.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/4088036004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fisulefajow/57403977940.pdf
    • https://uploads.strikinglycdn.com/files/2caebfe8-df5d-4440-9044-2a450c8e9f76/zulimugexat.pdf
    • https://s3.amazonaws.com/tanikanaw/best_hd_movie_kabir_singh.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_off0000f225.bin
fe00cc67c57fa42221a3688d8c1f37f866ae0aebdcef5a4f6dde46494d490a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 5716 bytes
font_01_sfnt_off00010571.bin
27e71add1b81c0de4f75f3ada893adb4a296477f7eca6b4faa4e9f7cb845435f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 11108 bytes

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