Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3777a0d5da33186…

MALICIOUS

PDF

49.3 KB Created: 2021-06-11 06:27:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca1e60489b2c1cc6d6e4a575e8ef16cf SHA-1: 94f4843a3377a650f6013911a96345247e5d8325 SHA-256: c3777a0d5da331863a2582c7edb4939d7a5bc8c5a415984ebc3302c5b6204906
160 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'game hack generator' which redirects to known malicious infrastructure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

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/codes-jeu-hack-roblox-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cheat-roblox-jailbreak-money_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-roblox-executor_GM431946152.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_off00005170.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5170 28748 bytes
SHA-256: 1d52163a2468edcbde6a7aa5cd85e4364efd8a5fa442c5575c9b7b5a9c79d394
font_01_sfnt_off000092e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E8 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD3 18660 bytes
SHA-256: 29cef8daf20c3515ae84e43addf773cebece069b604d05f899747b933c7b9cfe

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