Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec4af7bbd94b84c…

MALICIOUS

PDF

83.0 KB Created: 2021-01-06 10:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71905925c91e844bfb77561f373adacd SHA-1: da579638e4552bf684942c391f41aa424bf8ecce SHA-256: 6ec4af7bbd94b84cd07e919f6b21e83d2351c69ac5a74a4e0dccfaff639a479b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Minecraft redstone comparator guide', likely a lure. The presence of multiple external PDF links and a critical heuristic firing for malicious redirector links strongly suggests a phishing or content-scraping campaign.

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://cctraff.ru/aws?utm_term=minecraft+redstone+comparator+guide
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/ab34c5c5c.pdf
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/kopewidebubemu_rikubizo_wubibulu.pdf
    • https://vafadujujuzigub.weebly.com/uploads/1/3/5/3/135312713/6814229.pdf
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8881da66944.pdf
    • https://cdn.sqhk.co/rilixuzewiv/iaieXvN/racing_in_car_2_free_play.pdf
    • https://jafakafewubili.weebly.com/uploads/1/3/4/3/134397715/liselodozu.pdf
    • https://vajemedodumuni.weebly.com/uploads/1/3/4/3/134351385/fodifosogaxan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/64b82bed-0ce0-4dbb-8ce4-ac76ab85dd56/cold_frame_plans_woodworking.pdf
    • https://uploads.strikinglycdn.com/files/9838f7d5-6701-433c-b068-3c125f0b3041/29322352854.pdf
    • https://s3.amazonaws.com/daselex/tizomalebapoxamef.pdf
    • https://s3.amazonaws.com/vajefam/bwv_846_prelude_sheet_music.pdf
    • https://s3.amazonaws.com/wenobagupexekap/72973370956.pdf
    • https://uploads.strikinglycdn.com/files/a7810344-c694-414e-a1de-181e05e4bc56/29686378420.pdf
    • https://s3.amazonaws.com/bipepezuwed/corona_sdk_composer_template.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_off00010699.bin
41f2fda0a0019df67b0cacecd49e0614fac89852745e3c7a28caa6e438977016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 5448 bytes
font_01_sfnt_off0001191a.bin
8ed9b6295b22204c310c0cba6b00183d4355ca650bbe1e9473cf7fc5e634944d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 11196 bytes

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