Malicious PDF — malware analysis report

Static analysis result for SHA-256 434748c3aff4463f…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 13:57:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c43433f541a7b94697c9989f28431a2b SHA-1: 9d6305a9d904721c398dc66afb31e0a6de4acf6a SHA-256: 434748c3aff4463f2ddd9b8a523384d844c0314843133210a323f6868e107d7e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generators' and 'game hacks'. The document body and embedded links, such as 'https://netcdn.online/app/406889139/free-spin-coin-master-2021-link-game-hack', are designed to trick users into visiting potentially harmful websites. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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.
  • 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/free-spin-coin-master-2021-link-game-hack In PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/roblox-hacks-giveaways_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E3 25652 bytes
SHA-256: d14e063f394cd84e27374d40d8dd7cea007ca47f5987e3bc6ee370af0b1e15d3
font_01_sfnt_off00008ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED2 3124 bytes
SHA-256: a0e4a5f378f23ac829e40ef1a0638115ffab18b17acd7561ed9b637601232063
font_02_sfnt_off000099b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99B5 18456 bytes
SHA-256: 7500aca679d0fadfbda1e17cf023a195ee80a601fef81e7f7ced8cf50182af56

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