Malicious PDF — malware analysis report

Static analysis result for SHA-256 4481c61ca2c7236d…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 20:09:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1fe1bef6b3f290d2f4d65ceaec3ce008 SHA-1: bd5f3373991394f3057b33e1eeaf9cdd9cac15d1 SHA-256: 4481c61ca2c7236d683d2b75367c74ce64f3de95fdf22604fe5135e5a99d0d00
160 Risk Score

Malware Insights

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

This PDF file employs a lure of game hacks and free in-game currency to entice users. It contains multiple links, including a primary redirector at http://netcdn.tw/app/431946152/how-do-you-hack-roblox-game-hack, which leads to further malicious PDF files hosted on salwangurgaon.com. The ML classifier strongly indicates malicious intent, and the heuristic firings confirm the use of redirectors and lures for malicious purposes.

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-do-you-hack-roblox-game-hack In PDF document text
    • http://www.salwangurgaon.com/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-redeem-codes-for-robux-october-2021_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/how-to-hack-bleach-soul-of-end-roblox_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox-old-guest-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox-free-download-linux_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/robux-hack-no-subscription_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/how-to-get-sea-star-for-free-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
font_00_sfnt_off00003016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3016 22908 bytes
SHA-256: 5ace269edc3c1103f374de8b255ada24f3ad32d4fd95bd3b67c13d4faca5fd35
font_01_sfnt_off00006390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6390 19292 bytes
SHA-256: 9995eaa591a4ae7360538d13bc69f9b48a4c6000d4d0fc373ba7f602d67ad74d

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