Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3c120329f15fe4…

MALICIOUS

PDF

45.5 KB Created: 2021-05-16 14:33:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 602ca1bb0fd2caf8e10ab002da38e9c6 SHA-1: 6d40f4f51b402c0319fc44b7c5070811b239add1 SHA-256: ac3c120329f15fe4a30f2dd5f74f6c4f179acd1cd1a6a463442f8a7d68304312
142 Risk Score

Malware Insights

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

The PDF document presents a fake CAPTCHA and a "secret recovery" lure to trick the user into clicking a malicious link. The primary external URI, https://netcdn.xyz/app/406889139/coin-master-free-coins-link-2021-game-hack, is likely a landing page for a phishing or malware download attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/406889139/coin-master-free-coins-link-2021-game-hack
    • http://www.himalassociation.org/himal/ck_image/files/roblox-mobile-hack_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-com_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-gift-link-2021_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/robuxy-com-free-robux_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-pastebin_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/ways-to-get-robux_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-coins-coin-master-link-2021_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/static-moonactive-net-rewards_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-mod_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/roblox-free-robux-com_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-pc-free_GM479516143.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-safe_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-coins-on-coin-master-without-verification_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-apk-april-12-2021_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/roblox-help-free-robux_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-code-hack_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-spins_GM406889139.pdf
    • http://www.himalassociation.org/himal/ck_image/files/free-2021-robux_GM431946152.pdf
    • http://www.himalassociation.org/himal/ck_image/files/simplysarc_GM479516143.pdf
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c90.bin
62b94446e68798922994a1ceb8dc7af4ee35f1f09c5a9ef8fd7a6f90fe8a4637		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C90 24960 bytes
font_01_sfnt_off0000854f.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854F 2880 bytes
font_02_sfnt_off00008f3a.bin
be459003f2db1a934c49859962f2962ce704e042ee0985c73311b64c11e09449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3A 18284 bytes

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