Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f924e35445f038…

MALICIOUS

PDF

33.9 KB Created: 2021-06-22 13:23:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eedb1cabeb2bf12e96b35fb124cf85c7 SHA-1: c9c2c31d19bd4b59c7a74d5192b94ea1a3f07591 SHA-256: 20f924e35445f038f7968596b8a9c410d4ba2a9c35cf4bbe21fe99832cde14e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded URLs, with a primary link pointing to a known malicious redirector. The document body and heuristic firings indicate a lure for 'free Robux' or game hacks, designed to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's part of a phishing or malware distribution scheme.

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.co/app/431946152/free-robux-no-buying-stuff-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/pubg-uc-shop-bd_GM1330123889.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/get-free-robux-if-you-finsh-ths-obby_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-roblox-safe-way_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-and-get-free-robux_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_off00003098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3098 21356 bytes
SHA-256: 94e1008e8a43d1758a406e0f530e76ae937c0eac03817a61c7fa25c3eed80d84
font_01_sfnt_off00005f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F03 19120 bytes
SHA-256: f0fd1c74819ea57d73bddc050a603a4119dba3ce24bdd4c4ded8c20843e7bfeb

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