Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f228e0d267b53e…

MALICIOUS

PDF

45.4 KB Created: 2021-06-07 00:54:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d87575b7fa50fc92576b6d8315aecf03 SHA-1: 54b1b2e70c9832848a6f2142fb92f798f0b88598 SHA-256: 99f228e0d267b53eb847add88bbce85c05491f04f95be67ff39a2c1b448e7b20
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a lure impersonating Amazon, directing users to a link promising game hacks. This is a common tactic for credential phishing or distributing further malware. The embedded URL and the nature of the lure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.tw/app/431946152/jetpack-simulator-hack-roblox-v3rmillion-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.tw/app/431946152/jetpack-simulator-hack-roblox-v3rmillion-game-hack PDF link annotation
    • http://cosver.eu/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/robux-game-com_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-clothes-on-roblox_GM431946152.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_off0000530f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530F 24540 bytes
SHA-256: 9d49036351c73f0520ec3243371d9d5daf4d7b5600f6a7934229be14e07bdba0
font_01_sfnt_off00008b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B68 19456 bytes
SHA-256: 78207e7ddf9d81310de7f8b76a139f2714116bc7af244a3c3f840b8925949c37

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