Malicious PDF — malware analysis report

Static analysis result for SHA-256 a930e0da998ac74d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 12:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4276de0d05ab9754936976e2e71655a6 SHA-1: 0dbfc5e6c4b6802755e890db33a614c50b43148f SHA-256: a930e0da998ac74d818f9f9d173e2cca4515316856cb7aca13edc9b9f0ba3dfe
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on them by promising game hacks and free currency. The primary link redirects to known malicious infrastructure, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow aimed at redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-daily-free-coins-link-today-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-vampire-hunters-2-wall-hack-how-to-do-it_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-skin-roblox-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacker-cloths-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/accesories-hacks-royale-high-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pubg-uc-vn_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-heaven-links-free-spins_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_002_off00002f2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F2A 22984 bytes
SHA-256: c1f21b77b1a6128898db4e92d017ce01a8168f89a63d83627a7614ee03f20555
font_01_sfnt_off00006301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6301 18764 bytes
SHA-256: c3a6dc1510edfeb5278f97bd9f0c4121939494e768760890d36d38c0704afaae

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