Malicious PDF — malware analysis report

Static analysis result for SHA-256 687415715cdee3c6…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 01:04:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7a070e1e529a36d1eff1711405e917ea SHA-1: 48b8ea3ca5370fee9094335d14c570db407f7044 SHA-256: 687415715cdee3c6512e1b498afd2b95470072e46c6cfd934a83db46ac1a323e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains lures for 'free spins' and 'free Robux', combined with embedded URLs pointing to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the lures suggest an attempt to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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 https://netcdn.xyz/app/406889139/coin-master-daily-free-spins-link-march-2021-game-hack
    • https://www.apartmani-mestrovic-krk.hr/files/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://apartmani-mestrovic-krk.hr/files/25-free-spins-coin-master_GM406889139.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/a-lot-of-robux_GM431946152.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/minecraft-free-app_GM479516143.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdf
    • http://apartmani-mestrovic-krk.hr/files/microsoft-free-robux_GM431946152.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-spins-cheat_GM406889139.pdf
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-coins-link_GM406889139.pdf
    • http://apartmani-mestrovic-krk.hr/files/coin-master-70-spin-link-2021_GM406889139.pdf
    • http://apartmani-mestrovic-krk.hr/files/claimrbx-free-robux_GM431946152.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-stars_GM406889139.pdf
    • http://apartmani-mestrovic-krk.hr/files/how-to-hack-roblox_GM431946152.pdf
    • http://apartmani-mestrovic-krk.hr/files/free-robux-no-human-verification-generator_GM431946152.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-attack-madness-hack_GM406889139.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/hack-coin-master-free_GM406889139.pdf
    • http://apartmani-mestrovic-krk.hr/files/roblox-free-roblox_GM431946152.pdf
    • http://apartmani-mestrovic-krk.hr/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://www.apartmani-mestrovic-krk.hr/files/robux-websites-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000491a.bin
0e16ac21786e1aaf4145a51b92a276b9c523c3c4da3c1872e40b9b5be26ea48d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491A 25408 bytes
font_01_sfnt_off0000832c.bin
3f9aae1fdf8799fca0c9fecd68bec18923aee995b2022bf59fb0518bf5a4831a
pdf-font-stream PDF embedded font (sfnt) at offset 0x832C 19044 bytes