Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec38e7a6ec7875e9…

MALICIOUS

PDF

46.4 KB Created: 2021-05-11 09:01:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bd92e9be432180b03415d92c477f825d SHA-1: 36f8b49b0be2b74792f3d1afce43822c22c50719 SHA-256: ec38e7a6ec7875e9b1a70c5e8bb1627010b9fdd2116448acc6e208424cf5e70d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links. The primary lure appears to be related to 'Coin Master' game hacks and free spins, directing users to potentially malicious redirectors and further PDF files. The presence of multiple critical heuristic firings related to malicious redirectors and link farms strongly indicates a malicious intent to drive traffic to harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-free-spin-software-game-hack In PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coinmaster_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/get-free-robux-no-human-verification_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_003_off00004cb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB6 25680 bytes
SHA-256: 84b2025fc23ddfe3c62f229844af598c514b2fe0d8452933d077e9a88ce4b8bd
font_01_sfnt_off0000860d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860D 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00009395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9395 18052 bytes
SHA-256: fae64eb33564783cbf84277a7ff47d82a2ae5ec1c1dc0520c64e362eeabcf4e5