Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47e48a3164db520…

MALICIOUS

PDF

45.8 KB Created: 2021-05-19 06:32:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36094ccfcba13eb06335f07dfcac05bb SHA-1: ad41d3e8880cddcae2f9b193c572a85648ac9f45 SHA-256: e47e48a3164db52003387877dd4a85b66e71d296f8b376ea7a9bfb6d23baba9e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/free-robux-without-verification-2021-game-hack In PDF document text
    • http://ggmtc.net/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-game_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/robux-sign_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/is-java-minecraft-free_GM479516143.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
font_00_sfnt_off000048f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48F0 24124 bytes
SHA-256: 48ec59753e19bfeb43d7e5d670ee925caf5e3a8db2b0467d0201c6a72688e318
font_01_sfnt_off0000805c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805C 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D04 19368 bytes
SHA-256: a82984a519d7edf94c6531cfcf7f8df3cbe602e214b877051ae5dee029c294bf

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