Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abf1138994fd5c3…

MALICIOUS

PDF

37.1 KB Created: 2021-07-06 20:57:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7a8c0bd536d87a0d4d0149f07e59ef40 SHA-1: 0555a909ffe9e4b2bcddbaa8cb8d67b43b5a087d SHA-256: 7abf1138994fd5c33038adaf684487fb8fb09359f3f04c575283dfb9278277e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coinmasterfreespinlink-game-hack. The document body and embedded links suggest a lure for game-related cheats or generators, which is a common tactic for distributing malware. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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/coinmasterfreespinlink-game-hack In PDF document text
    • https://tckontrola.hr/files/how-to-use-cheat-engine-on-roblox-undetected_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://tckontrola.hr/files/more-robux_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/how-to-hack-denis-roblox-acc_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://tckontrola.hr/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/happymod-hack-roblox_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/bruteforcing-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://tckontrola.hr/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/list-of-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/free-coin-master-spins-link_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_off000039b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39B6 23260 bytes
SHA-256: ac232895a509ee4d7c15d3a09f89b01212de56d4405099338653f1732632d310
font_01_sfnt_off00006e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E22 18516 bytes
SHA-256: a000f6d0810836f211bd69ad4954bd13017d955b6cad91c28efc413f8e97b1ec

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