Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406c2e3719a8b63…

MALICIOUS

PDF

48.1 KB Created: 2021-06-11 00:08:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7f85f1ef45bb704e12182f3354fc9ca7 SHA-1: 217cde758e75036d5bac1816d200705345f2c851 SHA-256: a406c2e3719a8b63181239f55dd5b3eec07390311521e89669e67b9f5b444806
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links to a known malicious redirector infrastructure, disguised as a game hack generator. The document body and extracted URLs suggest a lure for users seeking cheats or free items for games like Roblox and Coin Master. The primary link redirects to 'https://netcdn.tw/app/431946152/hacks-para-pixel-gun-roblox-game-hack', which likely serves as a gateway to further malicious content.

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.tw/app/431946152/hacks-para-pixel-gun-roblox-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-codes-2021-december_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.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
font_00_sfnt_off00004d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D82 27600 bytes
SHA-256: a97422bfce283c13f9e29d4aad6a94073e7afe9e05dca61dbcc6407354b7fa03
font_01_sfnt_off00008b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B81 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9829 18596 bytes
SHA-256: 51b39374dd1dc4203c7cc6732842b02f446fbc26d6a908f20cfa1b704e663144