Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ff0b387eec016a…

MALICIOUS

PDF

33.2 KB Created: 2021-06-28 18:23:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2ce064dee27aabdc7730e64474505e5d SHA-1: cb8cd4587d7364211af4796e711844a91a5eb559 SHA-256: 16ff0b387eec016a152f34bdb8233652ba80a7d4a0055b3f5aebbd84505dffbc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, disguised as a 'game hack' lure. This indicates an attempt to trick the user into visiting a malicious site, likely for further exploitation or credential harvesting. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/wow-to-hack-roblox-game-hack In PDF document text
    • https://www.kaojen.com.tw/upload/files/how-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-hat-codes-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/mcpe_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/huskybuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-app-store_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/artmoney-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/stella-roblox-hack_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_off00002a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7D 22548 bytes
SHA-256: 837172b1d2b95c2d1bf479a7ea9ca0429ed4daccfa55c702c5d8301b56ab5673
font_01_sfnt_off00005cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFC 19020 bytes
SHA-256: 9c45e143ad09067228763e1794d32650933bbe5fca044930425e3508e67d930a