Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91c767052f87ce0…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 10:54:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 67b3cd0da5480c68a06f6c7f003ad50b SHA-1: 7da8cd9a32def39370150f1fbbf663d2c8795c68 SHA-256: f91c767052f87ce046b3c3dd1207579549a56ce9f71c7e8de10fde1a19c8dbd6
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and free item generators. The primary malicious URL identified is https://netcdn.online/app/406889139/clean-master-free-coins-and-spins-game-hack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to exploit vulnerabilities or trick the user into navigating to malicious sites, likely leading to further compromise.

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/clean-master-free-coins-and-spins-game-hack In PDF document text
    • http://perpus.stihpada.ac.id/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-comcom_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/village-coin_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-daily-free-spins-link-2021_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_off0000533d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533D 24948 bytes
SHA-256: f40913fc56e4329d039621a8e72ec6260a7348ad0975162ba7ee56f14f354d10
font_01_sfnt_off00008c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2B 18132 bytes
SHA-256: 1cd25d0b7dc3a8185d8e8b92174428e8871a6a2908bfb4dc1c2b5806b24c5c26

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