Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff2db8dcc0b0d8c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 05:39:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6c0b8266b9fc94c42e6f61133af5ac27 SHA-1: 220bcf6dc9644a43101a333190a0e7b8ba7ba3af SHA-256: dff2db8dcc0b0d8c4e3d849da2823b84125f444071e9add513a7dc217b0ca567
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a lure, presenting itself as a 'free generator / game hack' to entice users. It contains a large number of external links, forming a link farm, that redirect to various PDF files hosted on `vieclamjapan.com`, likely serving as a distribution point for further malicious content or phishing attempts. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/free-spins-coin-master-2021-hack-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/hack-r-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-codes-in-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/all-google-exclusive-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-animatronic-tycoon-cheat-codes_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-cheat-codes-for-robux-and-tix_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-bird-simulator-cheats_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-minecraft-for-free_GM479516143.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
font_00_sfnt_off0000301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301E 22744 bytes
SHA-256: 40d61a6a9e7c3dc0ab3800dce46fda6c3d684a446714a46505aba3b2121278f5
font_01_sfnt_off00006323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6323 18748 bytes
SHA-256: dece67271f3fd4e8999ccd4a6dd7914935cdb9ef5748f57f9614127cea7fbe29

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