Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa8837630cb7c13…

MALICIOUS

PDF

36.5 KB Created: 2021-07-04 08:04:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fdf0b2f0b22f91d12d02be1159ae1439 SHA-1: 4cf783164d78de9ade6c8294c1b43570d6abae71 SHA-256: 4fa8837630cb7c137af3850bf51e7e3b097343393d628b1457be85279954b1df
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as generators for game cheats and currency, such as 'Coin Master Free Daily Spins 2021'. These links redirect to malicious infrastructure, including the URL http://netcdn.tw/app/406889139/coin-master-free-daily-spins-2021-game-hack, which is flagged as a malicious redirector. The document body and heuristics indicate a lure for free game items, likely leading to further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-free-daily-spins-2021-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spin-link-app_GM406889139.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-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-prison-life-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-mad-city-free-vip-script_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-blackhawk-rescue-mission-2-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-script-adopt-and-raise-a-cute-baby-free-admin_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/robux-free-online_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-pastebin-hack_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_off0000350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x350A 23288 bytes
SHA-256: 9e90d8a76f96a36f22925f1fa620ace06848431c3d16216538d678a52e135639
font_01_sfnt_off000069c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C1 19000 bytes
SHA-256: fe44b8dc0286c11eb9316a1d3eb321ff3ae19d9947d0f6ad420bc13b052cb0ec

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