Malicious PDF — malware analysis report

Static analysis result for SHA-256 a418c44a730ab4a8…

MALICIOUS

PDF

34.3 KB Created: 2021-06-19 05:20:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c99a4566e26b4041358429219ea724a8 SHA-1: a9cf779485f12ec6ff1c8e319ea10097e39ef39b SHA-256: a418c44a730ab4a87ec411a051a9e2a5cfe42c4bc812d371cd13ad060ff8849e
142 Risk Score

Malware Insights

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

The PDF document contains numerous links disguised as 'free generators' or 'game hacks' for popular games like Roblox and Coin Master. These links redirect to external sites, such as http://netcdn.co/app/431946152/free-roblox-ccount-game-hack, which are likely designed to host further malicious content or phishing pages. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a spam or SEO poisoning tactic to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.co/app/431946152/free-roblox-ccount-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-ant_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-andrbirds-head-roblox_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-girls-clothing-cheats_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/getrobux-ninja_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/games-to-get-free-robux_GM431946152.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_002_off00002e2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E2C 22700 bytes
SHA-256: f1747bbd7809e7b6116ee02640bcc55c050a0a43c574e910f0fd6fe657836158
font_01_sfnt_off00006155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 18896 bytes
SHA-256: 36614abb94c1a9d71ed2a0ba1ef1e85739a40db922e7a78ec854d0e84d93c62f

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