Malicious PDF — malware analysis report

Static analysis result for SHA-256 551ce53f82e66376…

MALICIOUS

PDF

36.5 KB Created: 2021-07-05 06:15:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 01d9d151c0098bdbdcfc93025beaeea5 SHA-1: c0e9b19f1a2ca67e972b9adf9b9ab8f24076d9bf SHA-256: 551ce53f82e663765a52c2c4d81ffd885d75c9d4e1d36cb14fd36dc1cd7bed74
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, masquerading as generators for game currency or hacks. One primary URL, http://netcdn.tw/app/406889139/coin-master-free-2021-game-hack, is identified as a malicious redirector. The document body and embedded links suggest a scam aimed at tricking users into visiting potentially harmful websites, likely for ad fraud or further malware distribution.

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-2021-game-hack In PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-do-u-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/freemobile360-info-free-robux_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/cute-outfits-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-to-hack-to-get-robux-for-free-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/why-cant-i-buy-free-hats-in-roblox_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-spins-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_off0000377b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x377B 23148 bytes
SHA-256: c2b5d3687f7d8c4e9e0fbdba5db8677a59bd02247fb44172c5c894e4969f50aa
font_01_sfnt_off00006bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBD 18400 bytes
SHA-256: 0cc69a54ece3ed14f72d45612a229cad946be49a09675100e3633ee455bac280

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