Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd0812892a8b560…

MALICIOUS

PDF

44.2 KB Created: 2021-06-08 23:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9dbf33e2c1a756f665b85f7c51e0c10e SHA-1: 3d1689d42327aa21edd932798f8fdd9beb2e2bf5 SHA-256: bdd0812892a8b5608956498c26c02a6595c1f9cf91f63b3037d6772ab8d10b5a
200 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically targeting users with lures related to game hacks and free currency. The presence of a visual download button and instructions for password-protected archives suggests an attempt to trick users into downloading and opening malicious files, likely to bypass security filters. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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
  • 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/roblox-cheat-engine-youtube-game-hack In PDF document text
    • http://mbbs.hr/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-roblox-accounts-pc_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/row-blocks-free-games-at-robloxcom_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-accsesorie-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-someones-roblox-account_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
stream_004_off00004fa3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FA3 24644 bytes
SHA-256: c9974594a939a842f08b93e6839cc596b5f506f037568c665125c85fe225c08b
font_01_sfnt_off000087ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EC 18992 bytes
SHA-256: 48b5a074c148b8404cdfe424603fef7a498a46d1815cfe82ed765f38151eb8f4

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