Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b63603dcd3a96a…

MALICIOUS

PDF

49.0 KB Created: 2021-06-03 16:18:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: adf51691251669ba9b2b29c5371b02db SHA-1: 57ac7d8a0db6a71c7ed676eb6ddb968865ec2eb4 SHA-256: d5b63603dcd3a96ae06a45d2afbba66a8dbc9efc9674b6b8ea17f5ac42346d1f
160 Risk Score

Malware Insights

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

This PDF document contains multiple links, including one identified as a malicious redirector, which is designed to lure users into clicking on it for game hacks or generators. The primary link, 'https://netcdn.online/app/431946152/how-to-earn-robux-for-free-2021-game-hack', is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and link-based redirection suggest an attempt to exploit users through social engineering, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/how-to-earn-robux-for-free-2021-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A5 26892 bytes
SHA-256: 62203663ea6b3686b96cd762d155b91465a063ad77cbc53102b8133c585836c8
font_01_sfnt_off00009075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9075 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00009b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1B 18808 bytes
SHA-256: 177d88bc60daff4309aceb58336b2ba1d1983158bcd2aa353c0aa46f075a8142

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