Malicious PDF — malware analysis report

Static analysis result for SHA-256 1637243b46305576…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 18:03:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fd95d969ae9d51ded3f0a18cb540dfe5 SHA-1: 6ee5bdbdd247bf6ef5b942e2103f839ebb6d6f0b SHA-256: 1637243b4630557652ff60ae59bb88981803b1e9bf5c5c411a0160160d83d6c0
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs, including one pointing to 'netcdn.tw/app/431946152/free-robux-thumbnail-game-hack', suggesting it is a lure for downloading potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of download and callback lures reinforces this assessment. Although no scripts were explicitly extracted, the overall structure and embedded URLs indicate an attempt to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-thumbnail-game-hack
    • https://ethraa.ae/userfiles/files/tiktok-views-free_GM835599320.pdf
    • https://ethraa.ae/userfiles/files/how-to-get-java-minecraft-free_GM479516143.pdf
    • https://ethraa.ae/userfiles/files/coin-master-free_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/free-gifts-coin-master_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/scaffold-minecraft-hack_GM479516143.pdf
    • https://ethraa.ae/userfiles/files/roblox-hacking-website_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/coin-master-in-app-purchase-hack_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/hacks-bacon-roblox_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-heaven_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/free-minecraft-account-and-password-generator_GM479516143.pdf
    • https://ethraa.ae/userfiles/files/free-spin-coin-master-iphone_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/roblox-pics_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd9.bin
81d1016d60c613b7dfeeee7976d0ec384cca9d390cecc23cf927df2ba95295fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD9 22292 bytes
font_01_sfnt_off000061a2.bin
adbfa614176d12f8fda67e6e8d5b73dbc28431768a4cac05a3d314a7f167f1c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A2 19336 bytes