Malicious PDF — malware analysis report

Static analysis result for SHA-256 916657c8bd0a5c11…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 03:34:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c6dfdc43e95865ff0327ff83d9f22848 SHA-1: fcb7501b8a6fd8613a253cb5f46a1adcc56535c7 SHA-256: 916657c8bd0a5c1150219301f2954a72c49ba92a9b607334a434a4443e9eaf18
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-link-daily-get-free-spins-amp-game-hack. The document body and embedded URLs suggest a lure for game-related cheats or currency, a common tactic for phishing and malware distribution. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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-link-daily-get-free-spins-amp-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/hacks-on-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/pubg-uc-gift-card_GM1330123889.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/no-bad-words-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/what-games-give-you-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/id-that-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-make-items-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/get-free-roblox-private-servers_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-obc-and-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/lazyblocks-com-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/nuevo-hack-para-dragon-ball-rage-cesarius-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-december-2021_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
stream_002_off0000316c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316C 23116 bytes
SHA-256: f900f59a783e9244d3cd06bf117a02d1bfb988e3ace9a35b4f9db278db6895df
font_01_sfnt_off00006590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 19024 bytes
SHA-256: a6b0f614ac39e0ea25c1b471df05359c20ad0f84406a652126b1030dae4d287b

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