Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3490f5022532ea…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 05:33:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 461d3cca37aa1d91bcfdd24b7070f851 SHA-1: d69faa7d645d11baf3d5efce39a158893b87d9b8 SHA-256: 4b3490f5022532eae730f904caded91592fee94a3893de774e260848b3e6fc58
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of a redirector to lure users to potentially harmful content. While no scripts were explicitly extracted, the nature of the links suggests a potential for further exploitation or download of malicious payloads.

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-free-robux-game-hack In PDF document text
    • https://eyeonhimalaya.com/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-strategy_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/hack-event-on-roblox_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-do-u-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-tiktok-video_GM835599320.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-free-master_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/krnl-download_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-attack_GM406889139.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
font_00_sfnt_off00002f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4C 23056 bytes
SHA-256: 037055a521899a9e0dfb8f8ecbb28b43fc078f70b46dd7e273e993c01e76701f
font_01_sfnt_off00006333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6333 18880 bytes
SHA-256: b6c4639a0efa27a474f01e4d286fb143e2370880626048fbfb2abea6535030cf

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