Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9a51160384eb9a…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 06:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a436baac0131ac996d14e41b746b87ff SHA-1: 104df52ac3852c40f0f17f38c9fd3fac9c9e5e26 SHA-256: 2a9a51160384eb9a35d8afd0a8fe023ccc759f7cb4bd64812406da6a1a264f56
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to SEO-optimized PDF files hosted on suspicious domains. The document body and heuristics suggest a lure for downloading an application, likely a game hack, which is a common tactic for distributing malware. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-2021-apk-game-hack
    • https://www.hotel-forsthaus.com/images/free-coins-on-coin-master-without-verification_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/can-you-get-robux-for-free_GM431946152.pdf
    • https://www.hotel-forsthaus.com/images/rbx-free-robux_GM431946152.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-free-spins-uk_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/free-minecraft-java-account_GM479516143.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-free-spins-for-today_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-free-cards-hack_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-free-spin-and-coin_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/free-roblox-clothes-templates_GM431946152.pdf
    • https://www.hotel-forsthaus.com/images/fb-coin-master-free-spins-link_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://www.hotel-forsthaus.com/images/earn-robux_GM431946152.pdf
    • https://www.hotel-forsthaus.com/images/hack-robux_GM431946152.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-hack-2021-without-verification_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-free-100-spin-link_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://www.hotel-forsthaus.com/images/coin-master-official-page_GM406889139.pdf
    • https://www.hotel-forsthaus.com/images/free-coin-master-spin-generator_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000497e.bin
5ebe442f14dfd85d36f301596f7519bbbc37a3a1d3d67fe8b52093379cb2527e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x497E 25472 bytes
font_01_sfnt_off00008356.bin
0171898879de63f826772f1aaca43c4afb825f5f143e0263167d5c085c4f41c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8356 18296 bytes

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