Malicious PDF — malware analysis report

Static analysis result for SHA-256 8138fc1df8a3cd01…

MALICIOUS

PDF

35.4 KB Created: 2021-07-07 08:42:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d3e82ae86c67856d097371a74a156a5c SHA-1: b4830d4ad7e277416fdb021932bc315a941b9f87 SHA-256: 8138fc1df8a3cd0132df82c32a663c4330cd8d92854a4da3fdd5e1ca92667992
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as game hacks and generators. The primary lure is a link to 'how-to-get-free-spins-on-coin-master-2021-game-hack', which is hosted on netcdn.tw. This indicates a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators 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/how-to-get-free-spins-on-coin-master-2021-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/game-explorer-roblox-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/get-free-robux-generator-parts-pokemon-silver_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/pubg-uc-on-discount_GM1330123889.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-pushable-noob-models-in-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-tokyo-ghoul-online-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/tiktok-free-view-kreatif-lucu_GM835599320.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-jailbreak-money-hack-download_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-hack-any-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/chatsfor-roblox-for-free-rubux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/hacks-for-treasure-quest-on-roblox_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_off0000332e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x332E 22824 bytes
SHA-256: 3458460195d982ea41d5a0de57cbc1f178e251af986c81da5d7c63058782ba16
font_01_sfnt_off00006640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 18740 bytes
SHA-256: 0260418c40462ede441e23edbbaa28f8ef5f7472ee43e2d563702d50e072c039

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