Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a167aa30f0b9743…

MALICIOUS

PDF

51.1 KB Created: 2021-06-09 09:36:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 03df39d18dafe14c5c80566cdeb6e282 SHA-1: ee788ea8dbf2e100073b6473d6f736d087031038 SHA-256: 4a167aa30f0b97431f3f935e07b851d764ca7ee6b3f1d73c2d15eaa79ec2279e
142 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 are structured as SEO-optimized URLs pointing to sites offering game-related cheats. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick users into interacting with these links. The document's content and structure strongly suggest it is part of a phishing or scam campaign designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/free-robux-pro-tv-game-hack
    • https://lms.mabbaca.com/__statics/gudangsoal/files/earn-robux-for-roblox_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-roblox-gift-card-no-human-verification_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-coin-master-spins-blog_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-spin-link-coin-master-today_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-free-spins-cheat_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-human-verification_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-glitch_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-free-spin-today-2021_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-only-1-step_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/how-to-get-free-robux-easy_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-fun-free-spins_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-spins-and-coins-coin-master_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/how-to-get-free-minecraft-skins_GM479516143.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/get-free-cards-coin-master_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-and-spin_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/was-minecraft-ever-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005205.bin
f7ca02aa5750c2f1a0b1e525f6014a63bb982b67e6ea789de8d88a585b68f52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5205 25064 bytes
font_01_sfnt_off00008b66.bin
e74f895bd9277b0b0162feefce2cb4a319c55226065157fb04455274bdd0ba98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B66 3928 bytes
font_02_sfnt_off00009848.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9848 5596 bytes
font_03_sfnt_off0000a4ef.bin
a8c6f7a5bb54e40c2632a8b8614ed541ef37038ef65b6f00c6da0023aad69b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4EF 18280 bytes

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