Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af51ddea4da8ed0…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 08:27:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: a4f636e7f692179b5e1c03ef45207e07 SHA-1: fc08e0d94d0c3eea31afe9962ec15f9aebb8e23a SHA-256: 4af51ddea4da8ed038bc58c9ef61d231a98841d3b6848006f42906fd5dde07bd
220 Risk Score

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/406889139/coin-master-hacks-for-gold-cards-game-hack In PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-games-no-scam_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/join-group-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/como-tener-tener-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/hack-para-dragon-ball-rage-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/is-there-any-free-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/hacks-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-roblox-accounts-with-robux-2021-april_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-assassin-knives-roblox_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-roblox-generator_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
stream_002_off00003403.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3403 22516 bytes
SHA-256: 6c144f034aaa5fad4a66a061553270ecddbc9919aa401abcb5d6adc080c249d3
font_01_sfnt_off000065da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DA 18416 bytes
SHA-256: 05bbfd58fa93bc695b21bb0c6c5cb13131497fa0aadcf4bf103cc410958f4448

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