Malicious PDF — malware analysis report

Static analysis result for SHA-256 9301c5120c9b4fbf…

MALICIOUS

PDF

49.9 KB Created: 2021-06-09 16:20:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 02b8766c51bce81d9fa20f7137fd787b SHA-1: acb508149bb5634333c393f2e0772ce25c481a2e SHA-256: 9301c5120c9b4fbfd350e3530a69eea4bd2539471ad4d57046b97fc7c2f504a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body confirms this by displaying a URL that promises 'Free Robux Promo Codes August 2021'. This indicates a phishing or scam attempt designed to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-promo-codes-august-2021-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/survivor-hacks-script-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-shirt-templates-roblox-lyon_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005394.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5394 26292 bytes
SHA-256: 89137d006c2e13d04127bdcf2698c565f74d5e1d241171a93f98a621d909f44f
font_01_sfnt_off0000905e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x905E 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D05 19396 bytes
SHA-256: 9190588a5995af5fedc6627a7a93419a3d2d04a9007a29e5ea70aa512941e0ef