Malicious PDF — malware analysis report

Static analysis result for SHA-256 91da416ea29c09a8…

MALICIOUS

PDF

32.7 KB Created: 2021-07-05 14:58:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 38666a33f080074a60c734fa8fa25a4b SHA-1: 174e59e575c88361b65d1988fe253696d7e003f5 SHA-256: 91da416ea29c09a811ded167a29ebbeda22880df1f95e72c538c69a986acc9b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn serves further lures and potentially malicious PDF files. The document body and heuristics strongly indicate a phishing or scamming attempt designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-robux-mod-game-hack In PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-get-free-gift-cards-roblox_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/apocalypse-rising-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/robloxbuddy-me-free-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/pubg-uc-quiz_GM1330123889.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-get-free-robux-on-alcatel-a5_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/get-free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/mcmaster-club-coin-master-hack_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
font_00_sfnt_off00002a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A13 22016 bytes
SHA-256: 635e9af285476e736d1cbe8afdbff3b4290d4de5b1a11df48c0bd4723d2e5955
font_01_sfnt_off00005ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC6 19088 bytes
SHA-256: 3c56140fee9dfb5ded46378f21a8de948775312b2d7b3282d1f8cc46bd34fe6a

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