Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4956c2790c5e94…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 11:10:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2ea3e17b78a721b2b0bd5ec56d0dcf24 SHA-1: a9c17d3626625339b54ee4cdf5cee8eecd227fa0 SHA-256: ac4956c2790c5e9452f36b60a6ec5c610b6d5283d64d34167d080bb069a3e375
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. 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 0.9865

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/479516143/how-to-install-minecraft-for-free-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/is-pokemon-go-a-free-app_GM1094591345.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-dominus-hat-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/tiktok-for-free-textbooks_GM835599320.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.freenom.comHeyIn 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_off000052e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E0 26076 bytes
SHA-256: 3bd57c53d909e1fba0b83a6328b105f4d40e661c9dbb6bc939d7b20915ac9e3d
font_01_sfnt_off00008d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6C 17948 bytes
SHA-256: 5e3ba7e4cd3ca4e9461728952bafe8ac7745d23e1bc3d1385ef5be4278fd35be

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