Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdb7546de006293…

MALICIOUS

PDF

35.5 KB Created: 2021-06-20 03:27:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 91262a5c97a31cfefc123df4a211e4e2 SHA-1: 1a6f5311dcbbe01e85119db2f32a00244ce60a8e SHA-256: acdb7546de0062936d3ca45af53eb107e3182f9e88bcb4cde198c8695d3fd11a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a phishing attempt to trick users into visiting a malicious site. No scripts were extracted, but the primary attack vector is the malicious link.

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-account-roblox-2021-game-hack In PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/play-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-codes-2021-real_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_off0000330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330C 22272 bytes
SHA-256: 3cede17d3ea0fe913c6cc396a6a980a023d8355b9c93f8c8434e64a042b1a988
font_01_sfnt_off000064b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 19296 bytes
SHA-256: f74488ebd253440644121babcafcee202dec37b99e8f5ebb4caa9f1b62b5dc1b

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