Malicious PDF — malware analysis report

Static analysis result for SHA-256 03905d3b31b48b57…

MALICIOUS

PDF

34.9 KB Created: 2021-07-09 00:21:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 276e10bd8fca29b29d81399d7571741d SHA-1: 30c05cfef04b1c6cbeff811ac42bf4f37e3ac3a8 SHA-256: 03905d3b31b48b576149a87c2ae045b176a7978cd6faca57c3caf494a307d191
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as downloads for game hacks and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a coordinated effort for link farming or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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 http://netcdn.tw/app/479516143/free-minecraft-resource-packs-game-hack
    • https://anshingtek.com.tw/image/data/files/infinite-jump-hack-roblox-2021_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/pokemon-go-free-download-latest-version_GM1094591345.pdf
    • https://anshingtek.com.tw/image/data/files/earn-free-robux-by-completing-offers-and-surveys_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/roblox-hack-scrip-synpase-free-present-warping_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/how-to-make-a-roblox-hack-script_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/free-robux-on-phone_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-robux-2021-no-hack_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/free-coins-and-spins_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/coin-master-update-2021_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/roblox-hack-download-2021_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/roblox-generator-2021-hack_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/how-to-know-if-you-are-hacked-on-roblox_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/https-web-roblox-com-games-2021202187-free-join-now_GM431946152.pdf
    • https://anshingtek.com.tw/image/data/files/minecraft-pocket-edition-free_GM479516143.pdf
    • https://anshingtek.com.tw/image/data/files/mcpe-master-hack-unlimited-coins_GM406889139.pdf
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-and-chips_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003307.bin
4313600426efad3300c6812c32efee0491b3c79d2515c4d55302fbaa79e9788e
pdf-font-stream PDF embedded font (sfnt) at offset 0x3307 22632 bytes
font_01_sfnt_off00006550.bin
bda17eedfc7e084af3a5cca25f434e93a480768e71f446ca4eb0faf9d35560c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6550 18464 bytes