Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc9ff15df4639d7…

MALICIOUS

PDF

34.7 KB Created: 2021-06-20 01:10:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1647b8bd2dae2f9b74fd14a422084f25 SHA-1: 15b73080f40b9d7baf7518ca736a1787dd43e0b2 SHA-256: 8fc9ff15df4639d736f4357a6fc66afea64c378c853a09e5def03a835ce8821c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a 'game hack' lure. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or social engineering attack.

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/406889139/coin-master-attack-block-hack-game-hack In PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-a-free-seer-in-roblox-mm2_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/get-free-spins-on-coin-master_GM406889139.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_off0000316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316C 22972 bytes
SHA-256: 6331344d5699b0b5b61c4ca42f1f81e3bbfc0875d03ecbfae3ae6fadc110d53d
font_01_sfnt_off0000651d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651D 18292 bytes
SHA-256: d2ba2b0e7a3f103841e549252e20483683215ddad8ac1b66f82bb541e66cd415

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