Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcc710ac380872a…

MALICIOUS

PDF

75.0 KB Created: 2020-11-27 11:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9779f1b4172559ad8af12758a1711f51 SHA-1: 97dbae1ed7fcc3fa666907899092bbdf7e9c3fb4 SHA-256: 6bcc710ac380872ab868e7915cc8647f9902c9420eb464de91f739c02382590f
302 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document exhibits malicious characteristics, including a critical finding of a link to known malicious redirector infrastructure. The document also contains social engineering lures, such as a 'ClickFix' attack, instructing the user to execute commands via Win+R or a terminal, likely to download and execute a second-stage payload. The presence of numerous external PDF links suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vcruntime140.+dll++microsoft+64-+bit
    • https://cdn-cms.f-static.net/uploads/4497646/normal_5fb82078547a2.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f8bd474982b2.pdf
    • https://sepubipig.weebly.com/uploads/1/3/4/4/134445985/xadotokos.pdf
    • https://pimizotola.weebly.com/uploads/1/3/4/7/134770615/temegonozaluxi.pdf
    • https://jolamaripewefof.weebly.com/uploads/1/3/4/6/134655052/lozuxa_fegilipamap_gorol_jarixam.pdf
    • https://cdn-cms.f-static.net/uploads/4486197/normal_5faf98d90f251.pdf
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f9400ebb6254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takebemanijewok/62953637121.pdf
    • https://s3.amazonaws.com/xanebavifamopez/124420068.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/37114400694.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_off0000e6a8.bin
0d032cf12243b6f308589817051a42e64655b8f1aa7560a362542fdbdb14f625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 5564 bytes
font_01_sfnt_off0000f995.bin
8e670ac7f2e8930617b9c40e049ee86faafdde5edddaa7cb07b2252d2d7486dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 11072 bytes

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