Malicious PDF — malware analysis report

Static analysis result for SHA-256 b435f93c11edff4c…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 01:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0fc088f50a5bacae4f6cbe64bd05ab57 SHA-1: 4fd1a822c3312da9ddf5b5f507b46c61f338212f SHA-256: b435f93c11edff4cbef1b67ac5f7167c64e214c8ee5c78dc0dfbc4ee0a15d8e4
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a 'free generator / game hack'. The document body explicitly mentions 'Free Robux Gift Card Codes 2021' and includes the malicious URL, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-gift-card-codes-2021-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/hack-roblox-redeem-card_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-admin-hack-no-dll_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-free-in-the-computer_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-free-skin_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_off00003039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3039 22268 bytes
SHA-256: 549f67bc1a1694cc0b71b462eb1a4ad6ff7be7b11f17949e4d4315668bee5590
font_01_sfnt_off000061de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 19516 bytes
SHA-256: 29e75f30c5e86761bb92b3b01e6b6c9178fe3a430d56702e6e4d31a38e0984ae