Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec4d2bd1b5f97dd…

MALICIOUS

PDF

37.5 KB Created: 2021-07-04 07:50:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1f4136a350459aa9c1ab649a23d92f96 SHA-1: 0580e681b950cb4523e576dd810e04c0e9cf6ab7 SHA-256: dec4d2bd1b5f97dd0f230424521947a98a5df8bc02e6ea7c20820a5d1d71db89
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, promoting free spins and coins for Coin Master and Roblox, likely leading to a scam or malware download. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/coin-master-free-spins-and-coins-today-gift-reward-game-hack In PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-fly-hack-november-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/dragon-ball-advanced-battle-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/hack-roblox-with-chrome_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/hacks-for-mm2-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-roblox-credit-card_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-on-xbox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/comment-hacker-un-compte-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/1b-free-robux-from-game_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-bc-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-picture_GM431946152.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_002_off00002fe8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE8 23172 bytes
SHA-256: d3aa8a7f98ca70d9a8517693de032b85d869b677ddccb384f0cb479d3c14b85d
font_01_sfnt_off00006451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E36 18692 bytes
SHA-256: d31088ae19f241ea86c3227f133fc8e6698cecaa627da06b5b2cde690df300ac

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