Malicious PDF — malware analysis report

Static analysis result for SHA-256 205ec5d437fb65d0…

MALICIOUS

PDF

36.5 KB Created: 2021-06-30 10:16:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9c9c30a21e3335f28313bec96496c4ec SHA-1: 39c3f623739e9176e69860b7aa45cb3364221d8b SHA-256: 205ec5d437fb65d0ae8fdb5a58e41ebb01a756b563d4d7d3dc801ce4eabcc6ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free in-game currency, specifically 'Free Robux', which redirects to a known malicious URL. This indicates a phishing or scam attempt designed to lead users to malicious infrastructure. The PDF itself does not contain scripts, but the embedded URL is the primary indicator of malicious intent.

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/431946152/free-robux-today-2021-game-hack In PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-roblox-accounts-counter-blox_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/flame-gg-website-hack-not-roblox_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-shirts-for-boys-free-shipping_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-outfit-from-roblox_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-exploit-2021-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-roblox-accounts-2021-may_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/mode-de-hack-sur-roblox-bee-sarwn-simulator_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-play-roblox-bloxburg-for-free_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-ro-gwet-free-robux-on-tablet-2021_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-robux-no-human-verifaction-and-survey_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_off00003643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3643 22492 bytes
SHA-256: c2e93b722a0c1fba2933029bed82e13771680dab1580d8e139a65f67780e4f99
font_01_sfnt_off00006879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6879 19472 bytes
SHA-256: 74194e92791f74ecdc073f1352bff84d344754d0990e32c39ad34a2dd711f58c

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