Malicious PDF — malware analysis report

Static analysis result for SHA-256 854fe206a8d6a7c6…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 05:05:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 88ad41d7eb9879f8a5cb74b12248db8b SHA-1: 49539b2ba9cd8cc7bec4d18118e25b10a96c8f2c SHA-256: 854fe206a8d6a7c6fbc92c7d309473cd099e949e02a83ca859181bbc303fd034
160 Risk Score

Malware Insights

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

This PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/robux-prices-game-hack. The document body also contains a "CLICK HERE TO ACCESS ROBUX GENERATOR" call to action, indicating a social engineering lure. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/robux-prices-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-roblox-bucks_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/vpn-for-tiktok-free_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/html-falso-para-roblox-para-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/equillex-how-to-get-free-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/tiktok-free-bot_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-character-ideas_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/links-hack-30-robux-adfly_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/cheat-online-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-codes-on-android_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-link-today-new-2021_GM406889139.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_off000031ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AD 22500 bytes
SHA-256: d6261ce8056b02cdf62aab5009602a270ff49be5c670f24f4425c6f8f6a3708c
font_01_sfnt_off000063e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E9 18824 bytes
SHA-256: 917b2b595c85e899e08b6a40e7434d48f59ea0235caebc632e03070b6eb7ba4e

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