Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91d87d1f7687eda…

MALICIOUS

PDF

35.5 KB Created: 2021-07-07 07:02:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fd15c78e67abdf463da2af637cea4ab6 SHA-1: 2735d477736272febe1c74bd11e99d92bad07877 SHA-256: c91d87d1f7687eda1df27449f8e98ebece5b605fd984518e6833ea9f1faa98e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure and websites offering game hacks and free currency, which is a common lure for phishing or malware distribution. The heuristic firings confirm the presence of malicious redirector links and a lure for game-related exploits. Although no scripts were explicitly extracted, the nature of the links suggests a potential for JavaScript execution or further payload delivery upon user interaction.

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/free-spins-on-coin-master-link-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-become-unkillable-in-wild-savanna-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-star-wars-game-passes-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-free-roubox-in-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-cheat-second-till-death_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/site-pour-hacker-un-compte-sur-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/black-free-tshirt-template-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-do-you-get-1m-robux-for-free_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-spin-app-for-coin-master_GM406889139.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_off0000344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x344E 22932 bytes
SHA-256: 82074bf39e09e6a340394cc33284c29ae481cacf1823b7dee4c910b6042cdc64
font_01_sfnt_off000067da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DA 18344 bytes
SHA-256: e8d74cdfafe168009f9dc4b70b31a19d6777835fd11eed0a51de0eb2e067c79b

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