Malicious PDF — malware analysis report

Static analysis result for SHA-256 80018125c6a0b174…

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 12:06:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 432a13065a16818c9544aaf963fb4b1c SHA-1: a76b82f514e9513ca54a75db1b57190f39bfbad1 SHA-256: 80018125c6a0b17402641adf87c6bdc6fd5e4729f107b335ee38b26d9b325492
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as 'free generator' or 'game hack' content. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be tricking users into clicking these links, which likely leads to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/cool-free-things-in-roblox-game-hack In PDF document text
    • http://librarysenior.com/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-funny-roblox-avtras_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-make-a-roblox-rc7-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/infinite-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/spins-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
stream_004_off00004e1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E1F 25148 bytes
SHA-256: 80dc946dc45be46c2b3008313b1f5ee280266b5e6fc22a7498c63b1f5894c260
font_01_sfnt_off000087ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EA 18524 bytes
SHA-256: 200f7a2b746aeaad3d7c6696a3df98189094dd35017c6cd6f2059f260585e70a

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