Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c34ec5747c27a1…

MALICIOUS

PDF

44.9 KB Created: 2021-06-11 00:12:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b33706a08c8a8cc2350afaf1f976ddea SHA-1: 2e6f4a16027c0adb3d7a86d0b39243a68e955247 SHA-256: 31c34ec5747c27a10610a6b5cae307e32f3f67dc4487f2cfa6fe84544910e95c
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple embedded URLs and a prominent link within the document body, all directing to sites offering game hacks. The ML classifier also flagged this PDF as malicious. The presence of these links suggests an attempt to lure the user to a potentially malicious website for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/hack-roblox-account-password-2021-game-hack PDF link annotation
    • http://sbm-nn.ru/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-counter-blox-credit-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-robux-into-your-account_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/blogspot-coin-master-free-spins_GM406889139.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
stream_004_off00004c6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6D 26692 bytes
SHA-256: f7cdb354e406dfa139051b7de00dfa4e00ed135e990fdf186555bce5c12bb247
font_01_sfnt_off00008998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8998 19320 bytes
SHA-256: 6cbe3d60991df25de6d2cad4183de6373ee937cedc40d8fd16175ec4819818ee