Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb59d3f92e9ede5f…

MALICIOUS

PDF

49.0 KB Created: 2021-06-10 11:26:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 71a765a84754aa75bb1fc7fa4a4290ea SHA-1: 283415fb32ad4bd26af7d67389bbe1f1b9ec35e6 SHA-256: cb59d3f92e9ede5f3b402286bb70d05f433e9e83c62d54dacebfc78ff7945d19
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link disguised as a 'free generator / game hack' lure, which is a common social engineering tactic. This link redirects to known malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/roblox-hack-scripts-android-game-hack In PDF document text
    • http://library.atim.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/best-roblox-hacks-gui_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/race-7-mejor-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/tbc-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-how-to-get-free-gears_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-an-egtv-tshirt-for-free-no-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-free-download-mobile_GM479516143.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
stream_004_off000055d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55D8 30936 bytes
SHA-256: 09b5dd61b7daafefe896538bfebe5ec09ddcb01312b963bc18c5560e1539affa
font_01_sfnt_off00009b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9B 18756 bytes
SHA-256: 571694e120f717a78acb08c7c85741feb4ba9f6b693db389f87187cef80ca42b

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