Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff12995605c77445…

MALICIOUS

PDF

47.4 KB Created: 2021-05-16 06:30:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9645183d46b42df60d53e6e95429e183 SHA-1: 4a879a21ebd971b9fc65525022715bcd5e6b1cb0 SHA-256: ff12995605c774450883094009ec76439f0b690297a1d53328d3ed6ddaee0d3e
160 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a game hack generator, which is a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. The embedded link leads to further PDF files hosted on a suspicious domain, suggesting a multi-stage download or redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/406889139/coin-master-hack-blog-game-hack In PDF document text
    • http://meisterhaus-guterl.de/images/block-best-robux_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-coins_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-roblox_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/getrobux-now_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/grab-points-login_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/coin-master-500-free-spins_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_003_off00004bee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BEE 25476 bytes
SHA-256: afc09f1d5c70827b47b1777988b6fbd100e7e3812de595786e55c77d195825a5
font_01_sfnt_off000084a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A8 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off000096c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C0 18292 bytes
SHA-256: 22b0b225586be0ab641070019fb62ecee061fdecfd03887ecf7d2eac6b46cbad

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