Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f85bfb4b29f1c81…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 08:20:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4f4c877f14f09fef5f9e6a997a72f8aa SHA-1: 51219a7e991c488d16097d6a7a390242b79fef6b SHA-256: 3f85bfb4b29f1c819065dd9c45f342ea95f3a923d45cb5231e24b7ed0721298b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a lure in its body text, directing users to websites that promise game hacks and free in-game currency. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs, including a high-risk 'game hack' redirector, supports this assessment. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a further malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/406889139/how-to-get-spins-for-free-on-coin-master-game-hack PDF link annotation
    • http://webstan.be/images/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://webstan.be/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://webstan.be/images/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://webstan.be/images/robux-converter_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://webstan.be/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://webstan.be/images/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://webstan.be/images/how-to-hack-roblox-accounts-for-robux_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_003_off00004aa8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA8 25032 bytes
SHA-256: b6024e74833369f70c67e67508fed1a4d09ef024bad2348b60df287df22002dc
font_01_sfnt_off000084c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C7 18052 bytes
SHA-256: 47440d657d3113c77609ac1f1fa23dbad16ef39c626e59ad062e9d3e25c5a4b9

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