Malicious PDF — malware analysis report

Static analysis result for SHA-256 f137a01444100fad…

MALICIOUS

PDF

33.7 KB Created: 2021-06-27 16:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f2406bff2338ae4c0bf30f800538cf44 SHA-1: 87ee109a68bb48e86050b8719ea4276c84e4f318 SHA-256: f137a01444100fad3a983ecf8cf4bddd2778d45048446eede6a2791eb5c086f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a malicious domain, likely to lure users into downloading malware or visiting phishing sites. The document body and heuristics indicate a scam related to game hacks and free currency, a common lure for initial access via spearphishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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.co/app/431946152/denisdaily-skin-roblox-free-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-make-a-roblox-rc7-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-cheat_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-apk-hack-download-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/click-here-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-free-builders-club-membership_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-bee-swarm-simulator-hack-script_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-hack-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spin-game_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_off00002cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CF7 21928 bytes
SHA-256: 3c0e39ef38a2c5af8bd4b9764822ec3ffa31a43c554c805eb74c02ff767933e9
font_01_sfnt_off00005d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D52 19460 bytes
SHA-256: 852e48be6a905c1cb07e6d9b7615ce9f6d1f43cc3db16ac2b9d1133d92ce6dd0

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