Malicious PDF — malware analysis report

Static analysis result for SHA-256 a509f6b01ac717f8…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 04:56:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 16e365aeb556baa28ced72612346e119 SHA-1: afbf32627c15932f392b9e56e31279b59a42fcdb SHA-256: a509f6b01ac717f87070f18b51653f4a54a61c4ecb1e97a84204f2cbc7c199d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains text and URLs consistent with a phishing or scam attempt. The presence of multiple redirector links and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-get-free-robux-inspect-2021-game-hack In PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-tiktok-coins-2021_GM835599320.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_off00005240.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5240 29460 bytes
SHA-256: 48bab79464dee0711899f9d2d6448689796e1cd1d6c0df3d93c3d7a66f47427f
font_01_sfnt_off000093d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D2 18860 bytes
SHA-256: ce3ed064aa5edd0392df1e1339c5fe7185c787e1752423b12e251104524d15bd

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