Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb6ac503db94c9b…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 06:00:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a8f6e77286764c21dde2b3daf4062633 SHA-1: fc2d80559c71e08b5e6b7636fe50476b63ff3394 SHA-256: 0fb6ac503db94c9b96ef79fc63d01aac3c805e55a2777c4c3218fc01a02b5495
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and free spins, directing users to a known malicious redirector. The embedded URL, http://netcdn.tw/app/406889139/free-spins-coin-master-hack-2021-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to trick users into downloading further malware or visiting phishing sites.

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/406889139/free-spins-coin-master-hack-2021-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/new-roblox-exploit-hack-proxo_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-make-a-computer-hacking-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/captian-underpant-book-in-roblox-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/injector-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/ho-do-i-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/comment-installer-un-cheat-sur-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-jailbreak-speed-hack-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-november-2021_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_off00002ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC6 22704 bytes
SHA-256: ff4ea4b4cf7e90f03918e9522af88166eeab56a40e6fc5150a2e38ec4b539124
font_01_sfnt_off0000618f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 18748 bytes
SHA-256: 06bff1013f90e97ddb143b22f706740fea58d84013a71a1f61bcbcc410d416bf

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