Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f78bdcc24ccaf6f…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 11:26:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7d9aabfb5050e8b37f29cd7dd7ec72cd SHA-1: c803af538ecdbe3ed1ba931dae2d06888d9c6e92 SHA-256: 3f78bdcc24ccaf6f17ad664e97f97e8b586cf0f5bd41eb55a1cef4ad850cbe39
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and free items. The primary link, https://netcdn.tw/app/431946152/roblox-games-where-you-can-get-free-stuff-game-hack, is identified as a lure for game hacks. While no scripts were extracted, the presence of multiple malicious redirector links and the ML classifier's high confidence indicate a malicious intent to lead users to potentially harmful content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-games-where-you-can-get-free-stuff-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-18_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-fly-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-2021-roblox-accounts-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-money-on-roblox-a-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-hack-2021-working_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-back-a-roblox-accunt_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-74-uc_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-bee-swarm-simulator-script-gui-free-bees_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/what-can-i-do-with-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-any-hat-on-roblox-for-free-2021_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
font_00_sfnt_off000052bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52BC 25684 bytes
SHA-256: eb89d79031cebc5a66feccb2fcd612d627665e13499abbcb2b6a75f1c0cc4652
font_01_sfnt_off00008e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1C 19208 bytes
SHA-256: 001553740e3c0b05927fab4d1db458efb8d7f95624433607553cb11c45b285c7

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