Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22681dddc83f7e1…

MALICIOUS

PDF

83.9 KB Created: 2020-12-28 06:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e4389db4507f384aacdd78654d235e1 SHA-1: 74ddab3af8a97c5b027d9b8d4e9df3310f550467 SHA-256: d22681dddc83f7e1f982cf9ab11eedfad1aa8b6cfe7b200e7cedfc154e52d1ef
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to redirect users to malicious websites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'cctraff.ru', indicating a malicious redirector. The presence of a link farm further supports the malicious intent, aiming to distribute traffic across multiple potentially harmful sites. No scripts were extracted, but the overall structure and link analysis strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/123?utm_term=chula+vista+high+school+registration In PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fe41d59df056.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/UWWDmhW/be_soccer_football_manager.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/jbePijZ/41212087760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5faba4d70f4e9.pdfIn PDF document text
    • https://bakabita.weebly.com/uploads/1/3/5/3/135309819/gujodajapaboxaw.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/zuzetakafigusi-rukal-fibawimun-balasubizijugi.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/qG5RjfD/tuviwelebebazewugiwoz.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/qlHhizJ/go_long_joanna_newsom_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/haDBjaN/23588901330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5fa3bdafe6503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/88627466977.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/xalamubozoxadijigan.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/scansione_antivirus_online_gratis_per_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/all_android_games_mods.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 3452 bytes
SHA-256: 08208604322680520c1e3b149dd1c894371bc9b2b0ae915270ca5d2c1916546d
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 5024 bytes
SHA-256: 85ee97eb5d770f27b20c92a7b264edff800278b35501a28786980f0e9f7637c6
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 12024 bytes
SHA-256: 2a3402cf72118f6c3d794853a4c697a40b6f3ec49fffe20dc8d686be4bf96c48

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