Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9112ace4104416…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 04:53:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4dd52f70e8e77fd0c1493be97c988fc8 SHA-1: 9521fafafc94f730c3631421482066731909f485 SHA-256: 1e9112ace41044165edf29574dbcd0d362764a7bcb84c406533a514425f7f673
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a 'Free Robux Gen' and containing multiple links that redirect users to potentially malicious websites. The document body and heuristics indicate a clear intent to trick users into visiting these sites, likely for credential harvesting or further malware delivery. The use of a known malicious redirector infrastructure and an IP address in one of the links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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 http://netcdn.tw/app/431946152/free-robux-gen-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/free-views-on-tiktok_GM835599320.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/pretty-cheat-codes-roblox-id_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-25-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-gtv-in-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/make-robux-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-twitter-codes-for-assasian-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-scripts-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-retail-tycoon-xbox-one-cheats_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-this-site-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-hacks-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/destroy-walls-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F14 22420 bytes
SHA-256: 4451fdca7de01b3b837af088a023230cd8a7e9b0e1be5311d7e327c5939ced2b
font_01_sfnt_off00006166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6166 18716 bytes
SHA-256: 241c7495b7b7869825a77847e0d47c1d78029990e0b32ebb48689777b4105741

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