Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed91f7f2b10bd07…

MALICIOUS

PDF

33.4 KB Created: 2021-06-30 09:24:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6c78a9fb86f4944f72931eab14a075e0 SHA-1: 574780d409e753c280fd535d600c80fda3f3fc26 SHA-256: 8ed91f7f2b10bd07ace3dccac49c125b358b82f65d6de6b3a2c4630bb6011f0b
142 Risk Score

Malware Insights

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

The PDF document contains numerous links, including a primary lure related to 'free Robux' game hacks. The heuristic findings indicate this is part of a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed to deceive users into clicking malicious links.

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.co/app/431946152/is-it-possbile-to-get-free-robux-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/did-roblox-block-cheat-engine_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-roblox-jailbreak-mac_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-give-robux-for-free_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/fast-run-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-roblox-pants-girl_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-gold-cards-hack_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
font_00_sfnt_off00002d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D0D 21780 bytes
SHA-256: ab4c56a84d7117dd322835824cccbcb6330e35052f5dfd816664ce80c42330f4
font_01_sfnt_off00005d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 19168 bytes
SHA-256: cf9161bd34013778699c99aada3bed105d7952a54e4d9092db5a3ad82260802d

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