Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ee90f4529ea7c9…

MALICIOUS

PDF

34.3 KB Created: 2021-06-27 02:33:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f262e300b3c841fe3c33d4609f91cff SHA-1: d58afe05e454180d9df747f630452df3ad3f621b SHA-256: 28ee90f4529ea7c93f10b5941e8b4a9ac9e248dc6ae17d963afd6f040f39e711
62 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, primarily pointing to sites offering game hacks and cheats for popular titles like Roblox and Coin Master. The presence of a visual download button lure and a callback phishing lure suggests a social engineering attempt to trick users into downloading potentially malicious files or engaging with fraudulent services. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/hacker-cloths-on-roblox-game-hack PDF link annotation
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-roblox-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-icon-download-free_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/robux-plus-live-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-galaxy-money-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-account-that-has-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-coins_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
font_00_sfnt_off000030a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A2 21980 bytes
SHA-256: d7343c1badbe084a32c3a351f9f7eeed6082077447ca094e29e44a96c8b61ae2
font_01_sfnt_off0000612e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612E 18928 bytes
SHA-256: 889b8322f7b33dd530197440fb6ee426f3b6508e60fead3230a132623585355a

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