Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ef658c79ed8cc0…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 08:06:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0c90788b318b03c9023ab3acb057ed86 SHA-1: d882220c3a8e7a66031bc6ba14e4539d63d082df SHA-256: c2ef658c79ed8cc0d5a8debf25fdcb06a5cbcbd6c2ef9f708e2b8766127e4baa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.online/app/479516143/how-to-get-java-minecraft-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick the user into navigating to malicious websites, likely for further payload delivery or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/479516143/how-to-get-java-minecraft-free-game-hack In PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hack-coin-master-no-verification_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_off00005539.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5539 26172 bytes
SHA-256: dc8930d148ecfac4c1bbe37c61f8e4ffcdca268d90c29cabe569e723c8af6718
font_01_sfnt_off00008ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC3 18152 bytes
SHA-256: b07ca7cfd9f4df49e8124e55bb29c456f703fc5bdce85e2b26b96107911b04a3

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