Malicious PDF — malware analysis report

Static analysis result for SHA-256 4189cf0f52f7c96e…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 17:19:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5590a3a5ccf40b119578e6273447d42 SHA-1: e4be67b7276f47b713faa294df3aa36250d88ed0 SHA-256: 4189cf0f52f7c96e06ceea2de867c80da094ef48e96df3f662794ed358d8a282
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains numerous links, including one to a known malicious redirector, that promise free game currency or hacks. The document body and extracted URLs indicate a lure for game-related exploits, likely to lead users to phishing or malware download sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/is-it-possible-to-get-free-robux-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-hack-club-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-robux-hack-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-adopt-me-hack-deutsch_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-jailbreak-hack-android_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-no-human-verification-2021-or-survey-or-offers_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-get-the-doge-package-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-workink-downloadable-roblox-avatars_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/robux-free-roblox-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-games-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-quick-and-easy-2021-with-no-apps_GM431946152.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
font_00_sfnt_off00002e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E80 21696 bytes
SHA-256: 77bd820ef793c120e2d8ec18922be09ff1dc8e3cb1a24eb60bc1b0cecd33ec1a
font_01_sfnt_off00005e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 19168 bytes
SHA-256: f24a5ada971d965804af58b04ee5b9b6367f2e4ca5c866edee18a0a4d3da7d81

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