Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d76ca85397da57…

MALICIOUS

PDF

33.2 KB Created: 2021-06-28 05:48:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3cf6846883af9635a198964792093f5c SHA-1: 1d93b48ef6c3b44792c3d6ca6af9f745c7bdbcb3 SHA-256: b8d76ca85397da5715e976a049721aa64f00449fb61cf2516895adda24ce8311
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1055 Process Injection

This PDF document contains multiple links to redirector infrastructure, masquerading as 'game hacks' and 'free generators' to lure users. The document impersonates the Amazon brand, but the linked domain does not match, indicating a credential phishing attempt. The primary link directs to http://netcdn.co/app/431946152/btools-roblox-hack-2021-unpatched-game-hack, which is associated with malicious redirector activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/btools-roblox-hack-2021-unpatched-game-hack.
  • 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/btools-roblox-hack-2021-unpatched-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/cheat-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-codes-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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
font_00_sfnt_off00002a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A49 22104 bytes
SHA-256: 8d04b0de290f30e0ddd667096482c683debcbd91839cdee1583229d920f26eaa
font_01_sfnt_off00005ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 19676 bytes
SHA-256: c2261bc59cba4f33e62fee1bee13ec77df0339f669586a5b81e0b4f819334331

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