Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bffb16aab940d2…

MALICIOUS

PDF

46.6 KB Created: 2021-06-08 22:27:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cb5360e446ca901a30ce4de22ca45d9d SHA-1: 5f3106892f0e4a76cae67e3feb3e8fcad5191bfb SHA-256: 27bffb16aab940d236c9b7ee66b9a3bdcd9d130a51ca0e69e50edaa67316d8dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains a primary URL that aligns with the heuristic findings. While no scripts were extracted, the presence of malicious redirectors and the lure suggest an attempt to lead the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-roblox-mad-city-vip-server-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-install-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-instantly-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/como-hackear-los-robux-de-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/wearedevs-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-gift-cards-live_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tower-of-hell-roblox-hack_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_off000051a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A8 30696 bytes
SHA-256: fa3bf5835cb9d2d119c3c2dae947e2d906b036c4b9a34e316175f1833c266a69
font_01_sfnt_off0000907e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907E 19376 bytes
SHA-256: 6598342a8d1903599be99267a44607a34e444612c6713f4652591afb1deb6221

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