Malicious PDF — malware analysis report

Static analysis result for SHA-256 5850a068423edf31…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 04:28:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf286ee13f18e97636f36db551eb1ddf SHA-1: c369fff8c3bd24708e73b4d36b3265ff4d092851 SHA-256: 5850a068423edf310c1b73d151e234ba460cf6bd097bbc7b8f59fdbebbae4495
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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 https://netcdn.tw/app/431946152/roblox-theme-park-tycoon-2-cheats-game-hack PDF link annotation
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/roblox-hack-validation-code_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/roblox-surf-hack_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-free-robux-without-surveys_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_off00004fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA4 24448 bytes
SHA-256: 23392962bb9ae4a797199328dc0dfa832e29ec2880fc7cab42b0699664317295
font_01_sfnt_off00008769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8769 19172 bytes
SHA-256: 378c7e0f847d299531cf10ef79e3b8ee92dff8b8c85b980ce728450c3e5c81b4

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