Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2baf6c8c1510fc4…

MALICIOUS

PDF

49.9 KB Created: 2021-06-09 03:20:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a2c88da8eaa1448a8dcc6bb58d8de25b SHA-1: 13cdcc49f334e0c282116b18a37f84eb6e37b75d SHA-256: c2baf6c8c1510fc4d5928c9b04424b3992c576f4ccdb288006064d88b95ab7d8
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, disguised as game hacks and free generators. The primary link directs users to 'netcdn.tw', which is flagged as malicious infrastructure. The document's structure and embedded links suggest an attempt to lure users to external sites that likely host further malicious content or phishing pages. No scripts were extracted, but the PDF's nature and the presence of malicious links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/test-all-free-roblox-gear-free-admin-scripts-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/super-power-training-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-ben-10-games-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-gift-card-codes-unused-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/tiktok-free-movie-website_GM835599320.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_004_off00005223.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5223 28172 bytes
SHA-256: fd4c72d443072a97efefeba79529aa51e0af24ac7a7770e5d9ae6b1b81371544
font_01_sfnt_off0000917a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917A 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E21 19008 bytes
SHA-256: c1fcc7fedb40b65d14c6082885debfad325bfcec7c0ff0451cc77b5781ed12a3

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