Malicious PDF — malware analysis report

Static analysis result for SHA-256 626f6e31f2c3ba22…

MALICIOUS

PDF

44.2 KB Created: 2021-06-04 00:14:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 53b860947f64a6e2db1ffca489a1ada6 SHA-1: 5bfe0026e7c754c19ab5810a7409675b0d8c3882 SHA-256: 626f6e31f2c3ba22cd93c271ed9cb926eda1850d0193939d418f6944954e830a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links that redirect to malicious websites, masquerading as game hacks and free account generators. The document body and heuristics indicate a lure to exploit user interest in such topics. The primary malicious URL identified is https://netcdn.online/app/406889139/completed-coin-master-hack-game-hack, which is likely used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.online/app/406889139/completed-coin-master-hack-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-rules_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-c9m_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
stream_004_off00004f60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F60 25496 bytes
SHA-256: e55b3059576fb51772a3c6a6db9db394294ce50a770dc4f62795a55d2404d4c8
font_01_sfnt_off000089cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CF 18400 bytes
SHA-256: 797855796ad56610e81a33532725bd96b3cb453fd24eae28a344109feab08f19

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