Malicious PDF — malware analysis report

Static analysis result for SHA-256 2120bd12bbe82d02…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 13:32:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4f1138d4d051d65c5e3c4a0d30e24ff8 SHA-1: 9513d48d07787d82af364e32742d6c812a5c8121 SHA-256: 2120bd12bbe82d02a74682a4e10ffd05404a02f9854fa6d6667a90fc739bb4d9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a known malicious infrastructure, specifically advertising 'free Robux' and 'game hacks'. The heuristic firings confirm these links are malicious redirectors designed to lure users into clicking. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest a phishing or malware distribution attempt.

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/want-free-robux-game-hack In PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/download-robux-hack-no-downlowdes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-legendary-swords-rpg-level-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-game-hack-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
stream_004_off00005219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5219 24548 bytes
SHA-256: 5b24ba5990d8918e84efab95ce799c48394b457bcaae9b65aaa613d5a64115f0
font_01_sfnt_off00008a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5C 18544 bytes
SHA-256: fe366c3cf9a749f091a1605be2ecac19afedab8fe40c5ac889795547c069fb95

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