Malicious PDF — malware analysis report

Static analysis result for SHA-256 be77551d4b4779be…

MALICIOUS

PDF

45.0 KB Created: 2021-05-13 06:00:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a3dc46efa2516f0c5ee90f77dfacf13a SHA-1: d982df05e2b14378d60bf74400ef684efb6a796e SHA-256: be77551d4b4779be4f6b170fb9c5cdba04d90d02f2bf6f98d2bdd0c2205a4779
142 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a fake CAPTCHA or human verification prompt to deceive users. It contains a large number of external links, many of which are SEO-optimized and point to resources related to 'free Robux' or 'free spins', suggesting a scam or a gateway to further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a high-risk document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/free-robux-generator-no-human-verification-2021-game-hack
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/rbx-free-robux_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-paying_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/hack-coin-master-without-human-verification_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-blogspot_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/coin-master-free-soins_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/free-coins-coin-master-link_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/how-to-get-free-roebucks-without-verification_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/worst-roblox-avatars_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/roblox-free-robux-website_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/free-coin-master-spin-app_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/free-minecraft-resource-packs_GM479516143.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/minecraft-bedrock-edition-free_GM479516143.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/coin-master-hack-spin-ios_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://e-learning.m2mpekanbaru.sch.id/__statics/gudangsoal/files/get-free-food-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004db1.bin
a3da46fc3e4c249e133ba6b8a6a153faf4a9d493bb5de17c41b300f20aee4b4e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB1 26036 bytes
font_01_sfnt_off00008aba.bin
cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABA 19260 bytes

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