Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb218d906d510905…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 01:31:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 32c145d1b20fd05d7997bbfa9ea2b2c5 SHA-1: ba1e1eaba0a639c7a212dc4500abdf07e8434eb5 SHA-256: cb218d906d5109050b9071ae0bc8a4ebfad9fdc7dea0cea1f5588b08e8b4df81
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' content. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-cheats-free-spins-game-hack, which is associated with a game hack theme. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead the user to potentially harmful content or further malware.

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.tw/app/406889139/coin-master-cheats-free-spins-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-promo-codes-october-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/pokemon-go-free-upgrade_GM1094591345.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/tiktok-free-dance_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-hacker-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-roblox-bc-for-free-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-combo_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_off00002f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7F 22176 bytes
SHA-256: d2e13b1294005912d03514cfced5bcc707f39852e9528575010c8d0a5c8f5d58
font_01_sfnt_off0000607b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607B 18340 bytes
SHA-256: 5b574630ba63934687ba1c5d1198d52a4a38a7938149e8912a812ffc97b040e9

Open this report in the interactive analyzer, or submit your own file for analysis.