Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e22afae4b3c517…

MALICIOUS

PDF

46.9 KB Created: 2021-05-11 08:12:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f10343d136777e8650c2f1e233da092e SHA-1: 0b678eec3a553866dfe733318f9397bbf9a49f1c SHA-256: 63e22afae4b3c5176fbf96783fbd54ee7b04f255330c694cef9d3872795823fa
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on them, ultimately leading to a malicious redirector. The document body and heuristics indicate a scam related to game hacks and free currency. The presence of numerous SEO-optimized PDF links suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/406889139/spin-coin-master-game-hack In PDF document text
    • http://lib.unar.ac.id//repository/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/minecraft-hacked-client-bedrock_GM479516143.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_003_off00004c0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C0C 27920 bytes
SHA-256: ef3008d8fdc24d0932fa2546759f4a2bdb57f9620ed68dccfbe858e4d67d0576
font_01_sfnt_off000089e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E0 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00009666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9666 17724 bytes
SHA-256: a288a8875d4658f6069a8caac4ff820547a50f75967c18edc494040e7262f101

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