Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3777667c1ef44d…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 02:05:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e82bb1e7f3b4d673cd21aad27a9b94d SHA-1: af13527c8c9dce9149be6d9bd91e980bcd54edd5 SHA-256: aa3777667c1ef44d020b529f72a17d2460a3319ea1b7631d182b023195c1b211
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL, http://netcdn.tw/app/431946152/how-to-earn-robux-by-playing-games-game-hack, which is flagged as malicious. The document body and embedded URLs suggest a lure for game-related cheats or currency, a common tactic for distributing malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.tw/app/431946152/how-to-earn-robux-by-playing-games-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/hack-to-not-die-in-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/working-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/download-cheat-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/easy-robux-hack-today_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/get-free-gear-in-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-penut_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/april-1-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-hacks-download-2021-with-virus-total_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-snowman-simulator-cheats-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-official-website_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/claimggearn-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-hacking-website_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_002_off000031f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F6 22712 bytes
SHA-256: 4b13a735c089dfb94ffd1caa49aa1b09fd5f8f1c3e8c9a812c6aa816a6b35329
font_01_sfnt_off000064ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 19504 bytes
SHA-256: f6fc067ac9594276e2330d2b38accea649532d0c754620ade876a78ce5db5867

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