Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cacee0c91d2882…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 18:54:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 54c1bbb909d824403dbf55ae9c74daf2 SHA-1: a6cc29a17a4904d25718355f35f9c109be94a788 SHA-256: 50cacee0c91d28825c239e7578d8234c899e1101361979b74ca8efeb636854fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/how-to-get-free-robux-hack-game-hack, which likely leads to further malicious content or downloads. The ML classifier also strongly indicated maliciousness.

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/431946152/how-to-get-free-robux-hack-game-hack In PDF document text
    • http://lib.icbc-indonesia.org//repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-roblox-executor-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-free-game-no-download_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-cheat-mad-city-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/claimbox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-make-a-roblox-thumbnail-for-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-hacks-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-ninja-dojo-tycoon-cheats_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_off00002fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAE 22340 bytes
SHA-256: 89b53f0ecf1c7becf461d2eaf27c61d7be591d95277689caf3636deb215460ab
font_01_sfnt_off000061a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 19152 bytes
SHA-256: a9bff55de90b7722e0be476df1c7a65da1171d9638b3b21a902752e59eae7e63