Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d0c383a9c562c5…

MALICIOUS

PDF

43.2 KB Created: 2021-05-12 16:32:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 264d878ef705c67a8cc153222ee746ff SHA-1: af200ef101837f9bb79594bc914a3ff9a4e76a5f SHA-256: 61d0c383a9c562c59f66e7fc533ff0220ef8c977fb7e9d1f0b0d28515a791914
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to malicious redirectors and link farms, masquerading as generators for in-game currency or game hacks. The document body and embedded links strongly suggest a phishing or scam attempt, likely intended to lead users to sites that may host further malware or attempt credential harvesting. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-generator-no-human-verification-2021-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hack-coin-master-dzooka_GM406889139.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_003_off00004c0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C0E 24180 bytes
SHA-256: 9b20905cf5b65331650174d512c8f14ab73cf0168d3bb9ca8de855b8e98f0423
font_01_sfnt_off00008383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8383 19260 bytes
SHA-256: cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4

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