Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec42823390aeb2b5…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 08:13:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c044f3a5b53ccd8f3224c81555af5cf1 SHA-1: 9c7f30a7886e3f5efde6b5e880d1b51b44890c2d SHA-256: ec42823390aeb2b51fa7ec8f86c635f35a2650ddebeea1810b0ce83b4db0c92c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, with a primary focus on a URL associated with 'free generators' and 'game hacks'. This lure is designed to trick users into downloading or navigating to malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it links to known malicious redirector infrastructure.

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/hack-coin-master-using-pc-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-level-7-free-script-injectors-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-script-executor-2021-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-codes-2021-not-used-october_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-card-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/games-with-free-segway-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-fly-with-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-studio-how-to-make-a-free-robux-game_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-accessories-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-apocalypse-rising-dll-hack-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-worlds_GM479516143.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_off0000314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314A 22952 bytes
SHA-256: bb1df072eea2deee88b29274f7598b35f7256f5d8a594c7ab446a358e83a416c
font_01_sfnt_off000064db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DB 18344 bytes
SHA-256: 08102da4ea09a52e4071edb3cc524d8c09c0e7210534b5c357e9b023d3912be5