Malicious PDF — malware analysis report

Static analysis result for SHA-256 811be43f3398a5aa…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 08:40:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9cf6765fcb08a347f90a65f521b0f793 SHA-1: 6146dc624aa4aae471da2923fc2b6e3ea25543d1 SHA-256: 811be43f3398a5aa4cdbf6918c83a3e0095fea1b367364106c4d347e0319c49e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains numerous embedded URLs, including one pointing to 'netcdn.tw/app/406889139/coin-master-apk-game-hack', which strongly suggests a lure for downloading potentially malicious applications or cheats. The ML classifier also flagged this PDF with high confidence. The document body and embedded URLs indicate a theme of game hacks and free items, typical of social engineering tactics to trick users into downloading malware.

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-apk-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pubg-uc-voucher-code_GM1330123889.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-landon-rb-pants-template-psd-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-no-human-verification-2021-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-roblox-download-for-chromebook_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-toy-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-free-item-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31AD 23036 bytes
SHA-256: 0c5c0b89f527c97999b68139dd074190d19edab21ddefeedb37ce5564edb934a
font_01_sfnt_off00006519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6519 18180 bytes
SHA-256: ccb4bd86540267ecf8d8b16f9ef9319d477a0690c534ef42a6f6fd2086dc6ea9

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