Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba0f31610dbd7c0…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 14:52:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f6ee80222f62befae4cab20e2f2a8681 SHA-1: e06963b13f53891359bdba0840dfeff81212a024 SHA-256: 8ba0f31610dbd7c0a23ba5054172836c059058a07547f1e698089bcb0f61d805
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites that promise game hacks and free in-game currency, such as Robux for Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users searching for cheats. The primary URL http://netcdn.tw/app/431946152/mobihack-net-roblox-hack-game-hack is likely the initial landing page for this lure. No scripts were extracted, but the document's structure and content strongly suggest a phishing or malware distribution attempt.

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/431946152/mobihack-net-roblox-hack-game-hack PDF link annotation
    • https://razredna-nastava.net/files/roblox-free-robux-code-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-robux-with-cheat-engine-62_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-2021-robux-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-noob-costume-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/blox-piece-script-hack-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-cheat-with-fake-paypal_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/get-more-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3150 21760 bytes
SHA-256: 3c0c6352444ddf82ff3ef2c2335356970d387acf95853681db503ea9a265b168
font_01_sfnt_off00006105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6105 19244 bytes
SHA-256: 88e598bc89789b8ac21b9f126080391bbc9d3fa977fc33123edec0983ecad616

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