Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61624e6b6897ade…

MALICIOUS

PDF

36.2 KB Created: 2021-06-20 08:16:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 40d487456ce1dd79005d1f90792a49aa SHA-1: 765a1006e2c9bc3cd83846e8e282e19f37ee3d6a SHA-256: d61624e6b6897ade8f7c08b479ec48b6dc33eb5023e361c2319bdbd9c66ae839
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack' for Roblox. The document body also contains the same URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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/best-free-roblox-executor-game-hack In PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-jailbreak-noclip-hack-download_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/woman-roblox_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/real-working-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/pokemon-go-free-and-home-transfer_GM1094591345.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-july-29_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_off00003588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3588 22844 bytes
SHA-256: c4fcf231cc09cdb29d706b806094d2013a8e9a41f1238084ad9218ea1f36c6a5
font_01_sfnt_off000068ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 18896 bytes
SHA-256: b068693695ac9092ad6abe57a91b58dd13aa3e316adee39bbb6f8e267804ee4f

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