Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d03e4fc5b2522b…

MALICIOUS

PDF

34.7 KB Created: 2021-07-08 15:48:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 02d04eb4dced81263eee35bc51dbef47 SHA-1: 9384284a1a0232957e3e4d89d9a453008e081243 SHA-256: c4d03e4fc5b2522b44f804420d6eb7d6f39af3d324a0b7e455a38b2be702aa91
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, designed to lure users into clicking on offers for free in-game currency or items. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/406889139/25-free-spins-coin-master-game-hack In PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-no-app-download_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/default-fortnite-roblox-tshirt-free_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/pubg-uc-new-redeem-code_GM1330123889.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/online-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-become-admin-using-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-in-obby_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/grab-points-login_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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_off0000313e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x313E 22696 bytes
SHA-256: 72297efddfcd358878d1f5da8521af0f5e6c1825c9129bd8458f37eaa22fbb09
font_01_sfnt_off0000643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 18432 bytes
SHA-256: ec79058dc3660cd38899abd0af6a529c62159de1466b2a8febb865623eb50a1d

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