Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d33c7bece2210eb…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 14:30:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 05c4e7455234d1bafa3ff609cb771db2 SHA-1: 19a9f7311fdfc8cc7808b16b5d2831af3b1cc5d4 SHA-256: 9d33c7bece2210ebcadfdc0199deee38fd1952934d652826f3ea8a13244ed0aa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links, including one identified as a malicious redirector. The primary lure appears to be related to 'game hacks' or 'free accounts', directing users to the URL https://netcdn.online/app/479516143/minecraft-java-free-account-game-hack. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content or further stages of an attack. The document's structure and content align with social engineering tactics to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/479516143/minecraft-java-free-account-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005427.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5427 25232 bytes
SHA-256: f911c3f63edadc80051806958c0d630e6269cc83dd4a31fdafd9e0fffb9a831a
font_01_sfnt_off00008e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E60 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off0000986f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x986F 18128 bytes
SHA-256: 787ae5aa2fe8ee3e05b40f55ac2adb21d77115e18bda7782f632936ac93a1380

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