Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39f55252ee6504…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 21:30:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a40c784b08dba1b38c36c23400bc16e9 SHA-1: 380c5be2b1747e1d0be4bac7c253c33a67c8fbab SHA-256: da39f55252ee650450f104a00f242b8be37c9e98f887c910f0188dbe38109ce5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with the primary one being http://netcdn.tw/app/406889139/cone-master-game-hack, suggesting it is intended to download a secondary payload. The document body and extracted URLs indicate a lure related to game hacks and cheats, likely to trick users into downloading malware. The ML classifier strongly flagged this PDF as malicious.

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/cone-master-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-money-in-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-how-to-get-every-emote-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/synapse-roblox-hack-dll_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cheat-qui-dupli-sur-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-hair-extensions-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hhttp-free-robuxwin_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux-hack-android-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/greenlegocats123-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-ore-finder-mod_GM479516143.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_off00003085.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3085 23268 bytes
SHA-256: bced9af17bf5b58c14dbac1dc3c0f1d117dc275415e549e37dbc7c063c01dc98
font_01_sfnt_off00006526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6526 17712 bytes
SHA-256: 1d2b8c84664aeb21ec7d812a4df566ec291b937f93597c41560adcddb13db525

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