Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a81ba4d981453d7…

MALICIOUS

PDF

35.4 KB Created: 2021-06-20 11:10:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 452e94fd9bb9a327eae2a125a76e33e7 SHA-1: 31050cc5badded8bac9a96d3d9d99a9eb94b57dc SHA-256: 7a81ba4d981453d7cf26b13d23c6ed12ede6f7d9131b775315afc9fef4d83978
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users interested in game hacks and in-game currency. The document body explicitly mentions 'game hack' and provides a URL that leads to malicious infrastructure. This suggests an attempt to trick users into visiting a compromised site, likely to download further malware or engage in credential harvesting.

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.co/app/431946152/how-to-make-a-group-for-free-on-roblox-2021-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/haxteam-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-robux-free-deutsch-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/btools-hack-pastebin-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-account-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-bloxburg-hacks-instruction-and-screenshots_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/no-download-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-vip-hack-fashion_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_off000032cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CB 21828 bytes
SHA-256: 57cb18e824e10b29b4f6e0f4bc2de3e0a4fc7fd272d1602fc49f460c653b936b
font_01_sfnt_off000062b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B5 19900 bytes
SHA-256: d919f57f788dede53dbbeb9157e7f7d88f54e429e9631793ce44ba2f7fa8b084

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