Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7963d4c0250e4ca…

MALICIOUS

PDF

35.8 KB Created: 2021-06-29 14:34:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 13cef150fbfb6064f068871a52438a5e SHA-1: 3d7420bcaf1eb76c2fae9b385c0e48e17e542dbe SHA-256: d7963d4c0250e4cae8a1c30a5e333d49f091fe32fd2f8eb5db39d3c02e6c6bbb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically targeting users with lures for 'free generator / game hack'. The document body reinforces this by displaying text related to obtaining free Robux and includes the malicious URL. This indicates a phishing or scam attempt designed to redirect users to potentially harmful websites.

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/how-to-get-free-robux-on-computer-no-hack-game-hack In PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-hack-roblox-on-chromebook_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-trousers-roblox_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/download-hack-in-roblox_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-and-tix-generator-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-roblox-gift-card-codes-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/cm-spins_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C0 22572 bytes
SHA-256: cb235862c26b847b1eeacd134b3ee33daafbd85847fe1e11be005f438e9f06ab
font_01_sfnt_off00006534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6534 19588 bytes
SHA-256: ebfb17e2800d1209c9d60770c338a5928c78b445280e0c100ef42c3ac34391bd

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