Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc5540f7721ff5b…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 11:50:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 753e1bc48b7886049578ae968f40676f SHA-1: 97a011a8a25aefd74d0e93c71688cc4aa66aec69 SHA-256: 8fc5540f7721ff5b59e35e5253a60b8d6e35ca73de352758e8e71e407ba16369
160 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting game hacks and cheats. The heuristic firings confirm these links are associated with malicious redirectors and a lure for game-related content. The presence of a visual download button further supports the deceptive nature of the document.

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.online/app/431946152/roblox-re-game-hack In PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-buy-pubg-uc-for-free_GM1330123889.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-download-wurst_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
stream_004_off0000517e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517E 26200 bytes
SHA-256: 35a0a69159e18fa0e9230405ec977de5d89143807233c9e628dcf236fe34e401
font_01_sfnt_off00008f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F10 17784 bytes
SHA-256: e51c91fae2f03f6f1e769b6466fc692d64b30edfed93825068737b7a11e94355

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