Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ab8431b6604bb4…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 21:32:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fdfd94abfd3ac763e08cef91a8969d7b SHA-1: be9f23b8012dabac27a0d821c98cb23d6290f42e SHA-256: 64ab8431b6604bb4d00b8acb450a7aeaed5a5dbc6e5fd116f1cdb43aedfe0ad0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free in-game currency or hacks for popular games like Roblox and Coin Master. The primary link, http://netcdn.tw/app/431946152/ways-to-get-free-robux-2021-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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/431946152/ways-to-get-free-robux-2021-game-hack In PDF document text
    • http://www.myresidence.lu/userfiles/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-roblox-yolasite_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-giveaway-now_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/best-parkour-free-run-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/comment-hack-roblox-unboxing-simulator_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/join-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-everything-free-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/what-am-i-drawing-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/marshmello-roblox-t-shirt-free_GM431946152.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_off0000309d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309D 22776 bytes
SHA-256: a2164028d90b7abbe289887ca988a0be102433dd61b359cc1ca49582b7b3f2b8
font_01_sfnt_off000063a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 19600 bytes
SHA-256: c00d54827bcee88cdbe96b013b7ed3ba2b531ed1e4e5548e429b871c3375097c

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