Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc238ff0fada98a…

MALICIOUS

PDF

44.7 KB Created: 2021-06-14 01:18:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 25bc6cf1d8964c54348c8cd9386469a3 SHA-1: a37df5e096e98ed10c7f366a1b612fc75cbb1ded SHA-256: 4bc238ff0fada98acde867b9569ea9308632a0182dd2ff9dfb592444d555a805
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.co/app/431946152/cheat-kart-roblox-game-hack. The document body and heuristics indicate a lure related to game hacks and free generators, suggesting the primary goal is to entice users to click these links. The presence of numerous similar URLs hosted on library.persadabunda.ac.id further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 http://netcdn.co/app/431946152/cheat-kart-roblox-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-working-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/can-u-stiull-hack-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spin-link-list_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
font_00_sfnt_off00004925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4925 24772 bytes
SHA-256: bfbde0de817d1e688b6f4829f37bac2c80dda4ffbb98216555e4d130a84661d9
font_01_sfnt_off00008266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8266 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off00008c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C21 18280 bytes
SHA-256: a0f38b16f07a4e88b58ac16e60a8f31e985193ff7bc5926e5a001ff88766cd9c

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