Malicious PDF — malware analysis report

Static analysis result for SHA-256 10572c326635c2c0…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 19:25:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1835aa10aacb80bb71f95345b9750e1a SHA-1: 31454a4c3e0c3e46623fa477a6eb6f18a2480c3e SHA-256: 10572c326635c2c088921401a71127ab81b4759c2e6ff2d08777a6b2a5afbebf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game-related cheats or generators. These links redirect to malicious infrastructure, specifically the URL https://netcdn.xyz/app/406889139/free-spins-coin-master-october-17-2021-game-hack, which is associated with known malicious redirectors. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the primary attack vector is the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-spins-coin-master-october-17-2021-game-hack In PDF document text
    • http://meisterhaus-guterl.de/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/can-i-get-minecraft-for-free_GM479516143.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/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://meisterhaus-guterl.de/images/minecraft-hacks-18-9_GM479516143.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_003_off00004ce1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CE1 25224 bytes
SHA-256: 1f9211d18ea078148f7c03e08ad18e703f665f71663fca73601fa11d6d2e1151
font_01_sfnt_off00008730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8730 18504 bytes
SHA-256: aa7bff32dbd331c78ef5965829602ae5e6111fcf7e9748869226dce5f8ff9ec9

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