Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1a4f283641755b…

MALICIOUS

PDF

35.9 KB Created: 2021-07-07 19:54:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 67230d03d6b0c4dc8f803f0a83ef7a50 SHA-1: 660918ddaa70c4f3b01e1aec4b83eb3af5d03dc9 SHA-256: de1a4f283641755ba3474ab0cbedd9c0ecfa1d29d2cfc05c2798847914c020b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-today-2021-game-hack. The document body and embedded URLs are designed to lure users with promises of free game resources, a common tactic for phishing and malware distribution. The ML classifier also strongly indicated maliciousness.

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.tw/app/406889139/coin-master-daily-free-spins-link-today-2021-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-video-files-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/100-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-free-robux-no-real-money-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-free-robux-hack-easy_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/site-hack-roblox-xbox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-a-roblox-account-with-forgot-password_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3305 22936 bytes
SHA-256: 33bc94dc4b958b0313ab467b04f38841d9bb4bbaf0c6c9c11989900507afc1c9
font_01_sfnt_off0000663d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663D 19344 bytes
SHA-256: bda18ad7bc028b2989dfdc10c84b9c87c1dbf0242a88a3a6fbf9217f203e509c

Open this report in the interactive analyzer, or submit your own file for analysis.