Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fb46f34525d4f5…

MALICIOUS

PDF

52.5 KB Created: 2021-05-17 23:36:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 559b513103dd5f93e07a54553d87b05e SHA-1: a1adb2d19123735f285dd31c32f23434cea57d26 SHA-256: 21fb46f34525d4f5916b854364bbed1603bf024939dfdeb7c535992071622c0e
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a lure for free Robux, a common tactic in phishing and scam campaigns. It includes an external URI pointing to a suspicious domain, and multiple embedded URLs that likely lead to further malicious content or downloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9324

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.xyz/app/431946152/free-robux-without-downloading-apps-game-hack
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/robux-no-verification_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/coin-master-3533-android-hack_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/coin-master-hacks-that-work_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/google-play-coin-master-free-spins_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/get-free-robux_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/hack-coin-master-2021_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/coinmasterdailyfreespins-com_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/roblox-com-robux_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/free-robux-reddit_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/free-pet-treats-coin-master_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/free-robux-no-generator_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/but-link-says-free-robux_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/free-robux-codes_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/mcpe-master-hack-coin-apk_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/easypoints-gg-roblox_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/rbxfree-com-free-robux_GM431946152.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/coin-master-free-spin-game_GM406889139.pdf
    • http://e-learning.mapuicijantung.sch.id/__statics/gudangsoal/files/roblox-sign-in-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ca0.bin
390802358fb281a100dcb7670d7a8a9cc0a97ef6d6238b6bc16ef27d234315a6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA0 27892 bytes
font_01_sfnt_off00008de9.bin
0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE9 7420 bytes
font_02_sfnt_off0000a659.bin
7dd9be13e4665f5a35086e4b23dd28e6d3ecc39135d95cb28b9ae9c86552181a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA659 19876 bytes

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