Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9d5fc4dccf561e…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 18:02:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f444618b68b27fc92386407bd72ea75e SHA-1: 7edfac1fdb05abe076ded6f8826070b5365320bb SHA-256: 3f9d5fc4dccf561ede323e5b31dc39cbdf188efd0bc6a59a79c3d53229f3767f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The heuristic firings indicate that the PDF links to a known malicious redirector and is classified as malicious by an ML model. The document body and embedded URLs suggest a lure for users seeking in-game currency or cheats, which is a common social engineering tactic.

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/406889139/coin-master-hack-version-2021-game-hack In PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/best-roblox-fps-unlocker-free_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-roblox-gift-card-codes-2021-april_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/fling-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/denis-daily-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/download-skin-roblox-free_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/pubg-uc-website_GM1330123889.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/roblox-hack-download-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-hack-2021-android_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_off00003033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3033 23028 bytes
SHA-256: b913f4cfadc60725cb1020245dac0686e1860bdd97414db4086879cb4e1f79ad
font_01_sfnt_off000063c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 18540 bytes
SHA-256: a3ec429ffe06623bd52b1262868956d33dad6a2c24f78999791de678ad1c8db7

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