Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7b274478a158cf…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 14:57:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bca8fbb5d92f960104dfdae5187015f8 SHA-1: bc4d1771522dfac6a8a2c1f42aab38204d20fcb6 SHA-256: da7b274478a158cf9cb17e64ea122d65c5814a8f69c7739e42a5a3edc6d93876
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a prominent external URI pointing to a site offering free game-related items, likely as a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a visual download button further supports a malicious intent. The document's content and embedded links suggest it is designed to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/free-roblox-toy-codes-free-game-hack In PDF document text
    • http://alcomet.ru/images/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://alcomet.ru/images/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://alcomet.ru/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://alcomet.ru/images/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://alcomet.ru/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://alcomet.ru/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/pubg-uc-2021_GM1330123889.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_004_off0000510f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510F 26956 bytes
SHA-256: 50f96e6bec9065ccbae48cfb675e99772e6824208c31b628a55a0d4879fc8400
font_01_sfnt_off00008d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D28 18300 bytes
SHA-256: 61c572cb3620b4cd8f14a1e394f9b91f9f748a9789523e43842f9c1d8904fae7

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