Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa53cbd5caf4514…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 19:53:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b9638f72d014db3a5e517a8db2e98992 SHA-1: 585b30ea7d6934b1e674c3519f67490b6c22bf14 SHA-256: 9aa53cbd5caf45144af161da93fb446cb3e448c1c8e67c86bf7751c69a489335
220 Risk Score

Malware Insights

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

The PDF contains numerous links to websites and other PDFs that promise game hacks and free currency, indicating a lure for users to click through. The presence of a known malicious redirector URL and the ML classifier's high confidence score suggest this is a malicious document. While no scripts were explicitly extracted, the nature of the links and the lure implies a potential for further exploitation or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-promo-codes-generator-no-human-verification-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-scripts-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-roblox-hack-no-survey-no-human-verification-update_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-the-with-downloading-apps_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-admin-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-zombie-rush-hack-script_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-free-play-no-app_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-your-hacked-roblox-account-back-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-free-sunglasses_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-vip-accounts-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-do-you-hack-peoples-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/infinite-jump-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-robux-for-free-legally_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-free-hack-2021-agust_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_off00002e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0B 21668 bytes
SHA-256: 6ca17d8dfb9e5b952c3192a05d395497537ec1f31281e393a9e0b8bfa7e5c3f1
font_01_sfnt_off00005dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBC 19572 bytes
SHA-256: 748f25406de1f4d949a021297e7185f3754fd57334e45cc0bacb258ca6a6b056

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