Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dc4c40bc66614f…

MALICIOUS

PDF

48.1 KB Created: 2021-06-07 04:03:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: deb52a9e016169d8acbcf7f06dc74fef SHA-1: 8fb5984127ea06f659fd425c3671bd151f4899c3 SHA-256: c1dc4c40bc66614f3698ec4886fa29ac936080262efd9624dd1e60a329d52260
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirector infrastructure, specifically advertising 'free Roblox giftcard games' and 'game hacks'. The embedded URL https://netcdn.tw/app/431946152/free-roblox-giftcard-games-game-hack is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to similar lures, reinforcing the phishing and redirection intent.

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/free-roblox-giftcard-games-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-promo-codes-2021-november_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/getrobux-info_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-dayz-cheat-code_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-island-royale-hack-script_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-without-verification-code_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
stream_004_off00004ffe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FFE 28432 bytes
SHA-256: 88cc96710e9795a156619210afe48f9cdb96e53429852da72dffc4651b5a8245
font_01_sfnt_off00008d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D53 2984 bytes
SHA-256: 2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318
font_02_sfnt_off000097a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A0 18836 bytes
SHA-256: 7a42364145cbec60cdfe7e15437260d50780cbf57dfd6f40cfd8918a62f37143

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