Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b525052a5d26220…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 22:37:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da063d5c18eaf6a2d4ccb1c05eb7a986 SHA-1: f9572d1821d1334f5df10c0b9e5c60a595feb163 SHA-256: 3b525052a5d262203e7f2e969f9a6e9390a68168800b92e7517d058a133c85b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links to a known malicious redirector infrastructure, specifically promoting 'game hacks' and 'free coins'. The document body, though partially corrupted, includes text related to 'Coin Master' and a URL that aligns with the heuristic findings. The presence of embedded links and the lure of free in-game items strongly suggest a phishing or scam attempt designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/how-to-get-free-coins-in-coin-master-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robux-offer-wall_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/wurst-112_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/100-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/freerubux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-coin-master-download-ios_GM406889139.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_off00005006.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5006 24708 bytes
SHA-256: abc6f4e347b482574cb1782c8671c6a457c01a1b3d285bfafa4561f3e0ad7fe5
font_01_sfnt_off000087dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DC 17872 bytes
SHA-256: ea6dcb3ab890178a05547e3161835c8edeffae3732ad32b35eba99407f3e1bd5

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