Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb244e70483ce4e2…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 22:22:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 11aa7fe9cfef8a448ea62390921bf570 SHA-1: 7049454cc0c7d09f9d75143a1f61de2b8b5826ac SHA-256: eb244e70483ce4e2ed5c7bb1feebef6139c0401613a044640c0e4af2197d520e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a 'free generator / game hack' which redirects to a known malicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded URL and heuristic firings strongly indicate a phishing attempt to redirect users to malicious infrastructure.

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-piano-hack-game-hack In PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/robux-now_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/adfly-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://direct-link.netIn 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_off00004f16.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F16 25932 bytes
SHA-256: dc7d3be66f3737662ac0858550b6b881d6138e43c3b3bef9814302840512dd9f
font_01_sfnt_off00008b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 18456 bytes
SHA-256: b3a5bdafa913fbeb08409da0979c792cb3491f79dd739ad0ffcb7a8a40d00987

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