Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cc12a7af704fd3…

MALICIOUS

PDF

47.6 KB Created: 2021-06-08 15:15:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8012b5fdb1b2711f45d9f54174c3a80d SHA-1: b84945bcc9cfdf4af23784a78fc2d5472dd434b6 SHA-256: 85cc12a7af704fd3227608c8ad7098667d2e3ecef68be981f146e89db5f43fb5
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-roblox-itrems-game-hack PDF link annotation
    • http://perpus.fisip.unnur.ac.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-hack-game-download-mod-apk_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_off00005178.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5178 26296 bytes
SHA-256: d4f0a04d3a61b274b2106a3fa50876521dc216c8b88ba63dec030345d1768248
font_01_sfnt_off00008d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D94 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9744 18312 bytes
SHA-256: b5f99366153fe06a270922a2f3a72b5e2e03d02ee5f18e1f0d4346a4f3225a42

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