Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54e517d46a51386…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 08:43:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5f80fc99c4d79c58fbc7fe5b67288f23 SHA-1: c58bfe9f1a4fa563f33d353bb8e9767b89eebd1d SHA-256: e54e517d46a5138631e2cf6c60b98211d77408a1d38c3ef928aafc40996788aa
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to redirector domains and SEO-optimized PDF files, all promoting 'free generator' or 'game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-2021-no-verification-game-hack, which likely leads to a malicious payload or phishing page. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, potentially for credential harvesting or malware distribution.

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.
  • 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.
  • 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-2021-no-verification-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-someone-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-pokemon-brick-bronze-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-pastebin-no-subscribe-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-500-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-vip-server-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-hack-accounts-online_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacks-para-counterblow-roblox-offensive_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-build-a-boat-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-no-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-promo-codes-2021-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/como-hackear-roblox-2021-en-juegos_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/buzz-the-bee-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-gamepasses-script_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-scams_GM431946152.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_off00003207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3207 22800 bytes
SHA-256: e65e6edc27d264f3f995860f31bee42bd33c410ebc0bc4ff2ca91d76e9f91f24
font_01_sfnt_off0000651d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651D 19476 bytes
SHA-256: 55ad41a6ce49086aa15382541082a2b64ef707ba2ed30a01096caf72f6ded3f0

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