Malicious PDF — malware analysis report

Static analysis result for SHA-256 740b49b329e732d8…

MALICIOUS

PDF

36.1 KB Created: 2021-07-05 15:03:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4b659488fc2792d78211b2d7f6d2e812 SHA-1: 9e08c636cbb4641d9e369908a01023ce9a6584b8 SHA-256: 740b49b329e732d8ae8fe61bbb2ad3bd3c6bbbbb3ddb9e639f1b50593e751ae8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux 2021' and includes a high-risk heuristic firing for a game hack redirector. The embedded URL, http://netcdn.tw/app/431946152/free-robux-2021-game-hack, likely leads to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect users to a potentially harmful resource, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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/free-robux-2021-game-hack PDF link annotation
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-bighead-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-free-noneuy_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/pubg-uc-transfer_GM1330123889.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-avatar-animations-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/jailbreak-hacks-for-roblox-projec-alph_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-make-a-group-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-avatar-items-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/fake-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-hair-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/easiest-character-to-make-an-roblox-account-for-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-prisoner-life-speed-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/rbx-com_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
font_00_sfnt_off000034bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34BC 22760 bytes
SHA-256: 9dc1951d64c2655acd6266f33be7f3f882054dbe3facfb884643adf435ade8e3
font_01_sfnt_off000067bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BC 19116 bytes
SHA-256: bd102244ffb40c6add567cd3640126a26b927334c4b0bdc73f6a542841550b4a

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