Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9888db9b360be9…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 21:02:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 544becce61ab80068c24d81e75ec6a11 SHA-1: 61f3d3cf8322d297170af47c256d850115348099 SHA-256: bb9888db9b360be966034f457604b9aeba0ba096fce7ffdb247a5086703ab3eb
160 Risk Score

Malware Insights

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

The PDF contains a lure for game hacks and links to a known malicious redirector. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded URL and heuristic firings strongly suggest a phishing or malware distribution attempt.

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/479516143/minecraft-pe-apk-free-download-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-stop-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-buy-headless-head-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/google-how-do-you-get-free-robux_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_off000031a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A9 21368 bytes
SHA-256: 0046c77913bc752a287d9689213df448d3b2bd1d98036fd3a801b3eb3848d127
font_01_sfnt_off00006052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6052 19080 bytes
SHA-256: 7b5b97283c99b26de7673800ba150ecfa356c115ac03a12a62777470b154fcb8

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