Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8a82b90f461b07…

MALICIOUS

PDF

39.5 KB Created: 2021-05-24 20:01:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7cd98df8812a2fd2d92ff98723dae54e SHA-1: cf3c0e55742c5adcf4d3625de23a4bf4766f8f46 SHA-256: cf8a82b90f461b07c75f4b87dc1a358988c5f965e57766defce257bb67c114c6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains lures for "Free Robux" and impersonates "Paypal" to trick users into clicking a malicious link. The ML classifier also flagged this PDF as malicious. The document body and embedded URLs suggest a phishing attempt to redirect users to a site offering game-related cheats or hacks, likely leading to credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8323

Heuristics 4

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack.
  • 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-kid-friendly-no-human-verification-game-hack PDF link annotation
    • http://www.pspmrsmlangkawi.com/opac/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34CC 24148 bytes
SHA-256: a7b3ad05b96e99e4c3c0616b8071431be98694cff54a2f1568857b151ebe3ac4
font_01_sfnt_off00006bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF4 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000075a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A5 19288 bytes
SHA-256: ea469787df873758e357019bb53a1e3c4242eb718badaf8706c42bdc2f61c813

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