Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a755df37f682ca3…

MALICIOUS

PDF

34.9 KB Created: 2021-07-09 02:54:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8fe17e0059ab83f2012f399a80250814 SHA-1: defa448b77c9f84ada3d18978a4c9847f7bd995e SHA-256: 8a755df37f682ca3baa6660892857bff6afb099c35e2a62f5fb8d61d86bec1db
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites that offer game hacks and generators, indicating a lure for potentially unwanted applications or malware. The primary link, http://netcdn.tw/app/406889139/download-coin-master-hack-mod-apk-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at tricking users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/download-coin-master-hack-mod-apk-game-hack In PDF document text
    • http://www.tdbaska.hr/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/works-how-to-get-free-robux-2021-fast-amp_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/good-outfit-ideas-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-bee-swarm-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/ways-to-get-free-robux-2021_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_off00002ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFC 23132 bytes
SHA-256: c660e4ac81f8769878664ac77ac9a5748dd43a10f81d5b64dbbaa4d73a4c51ce
font_01_sfnt_off00006413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 18760 bytes
SHA-256: a9106ec8bdb2ef00eddd29af2fd5eb663302a9539c133b1226910953e26aec8b

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