Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3c15376fee88b0…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 05:50:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f905f179904bfeb68296e641b0e155bf SHA-1: f3619beb4592a867db6afa1162977d39ea3e4fe3 SHA-256: bd3c15376fee88b0f443a3defe9e055d48cd0b534677bfed3d85c7b957a89ba2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to redirectors and link farms, masquerading as game hacks and free currency generators. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-time-hack-2021-game-hack, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, contains references to game hacks and the same redirector URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-time-hack-2021-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/earnrobux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins--spins_GM406889139.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_off00004a73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A73 24080 bytes
SHA-256: 5729922572bbe2196d3ce70394267a607352cf90463c8540e9b52c3b15ef9a83
font_01_sfnt_off00008148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 18380 bytes
SHA-256: d61a4547520ea8cafecc3ed258c73b3244e9bc9b68d98ecd8e3226df3b2774a6

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