Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa57b82d8a25357…

MALICIOUS

PDF

49.0 KB Created: 2021-06-11 02:11:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e9e47a244b195211ceb87123a64cd229 SHA-1: 7b1d61527bf4e91775640c0dbfee87830bbf0f65 SHA-256: cfa57b82d8a2535798e1bd27cbecdf117ea14c3754e60d8a2948f5a18c667abf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a specific URL. This URL is also flagged as linking to malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

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/roblox-how-to-get-tge-free-trial-trial-bc-game-hack In PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/roblox-john-doe-when-they-hack_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/roblox-hack-invisible_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/freerobux-co_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/free-games-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/earn-robux-websites_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/instantrobux_GM431946152.pdfIn PDF document text
    • https://www.kabadixpress.com/uploaded_files/userfiles/files/roblox-free-robux-website_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
font_00_sfnt_off0000530c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x530C 27500 bytes
SHA-256: 688bbf1d471e22f324727edd370a76b82af55426973e3b1424eb0af70c7a555a
font_01_sfnt_off0000918f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x918F 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00009b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B29 18852 bytes
SHA-256: 3e606c5ef1f6d0004c1df2b3c2dfb9e8badec6751399c3b19e8e33a714d5b95c