Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3903432f48d3be1…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 04:53:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d22d54827b41b2fa8b1df10a0131f155 SHA-1: 121a101d7ae2126a9ba70fe32fcb3c2329163e56 SHA-256: e3903432f48d3be17a18f389e714c8b331a9df42cbc8d5b8364207a7f349d5c6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to game hack generators and free Robux sites, indicating a link farm or phishing lure. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the links suggests a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/coin-master-pet-food-free-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/freerbx-info-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/descargar-roblox-hack-robux-infinito_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hacking-into-a-online-account-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-clothes-in-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-fast-and-easy-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-red-pants_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-broken-bones-iv-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-hack-2021-no-human-verification-code_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/what-tiktok-free-views-app_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/stylish-animation-pack-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-rise-of-nations-cheat_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-1-pastebin-com_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_off000030da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DA 22716 bytes
SHA-256: 54577e4c8cf2a5f623a84e47c13af086ef477c5fd9dee120ad6968beec81cff0
font_01_sfnt_off000063b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 18324 bytes
SHA-256: 7f898f087de0c63ea34c3b0a8cd26138396bb89e1104774aa80067c589943042

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