Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ef4c7df129aee6…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 01:40:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6be5bb6a8aa0f7f2813c67c9f9ed9a0c SHA-1: 59095fe7e321522cfd3fae8494b8ba7da8a65878 SHA-256: b9ef4c7df129aee6264910a083b968780744a777dec0ae26f33366d72a3ad2cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators". The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links confirms a malicious workflow. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-robux-game-hack In PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/get-more-robux_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-spins-for-coin-master_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_003_off0000471c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x471C 26944 bytes
SHA-256: e40edd18bb510a876bb16edd067719ccbbb350c8ce10a6412d25315e726f81f6
font_01_sfnt_off00008378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8378 17924 bytes
SHA-256: 85e3be4e3e2e58a235542e1db776439a3ce81e3e8a81a438b582233699a3a0dc

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