Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb3ed79eb5e5551…

MALICIOUS

PDF

48.4 KB Created: 2021-06-11 06:12:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1de51432b1b16406d1d95539fe625c4e SHA-1: d73423c71692db28a40671613a974c4f1773c257 SHA-256: afb3ed79eb5e55510cda8e4c10fe7b529203d6352bf997b8e3cf7ff0e2615a22
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a website offering 'free Robux' and game hacks, a common lure for malicious content. The ML classifier strongly indicated maliciousness, and the document body text reinforces the lure. The primary IOC is the redirector URL, which likely leads to a further malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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-25-free-robux-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-unlimited-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coins-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-apocalypse-rising-cheats_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-hack-download-pc_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
stream_004_off00005462.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5462 29556 bytes
SHA-256: 3bfb54925d77c693b1a304d105e705b5f1d17f68ad5792d93e7249f4ab468d6c
font_01_sfnt_off000099df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99DF 18540 bytes
SHA-256: 42c05e6a323cd54f652dabcf83b8b0ac9958bd2da06a213c556bc6b52a5dafb5

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