Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac57674f6cf6ee4…

MALICIOUS

PDF

42.2 KB Created: 2021-05-16 17:13:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 30b827f9d0bda9ae4b9a456b3f5b7161 SHA-1: cba73a5582d59eec89565a5546340c85c9e08d1e SHA-256: 8ac57674f6cf6ee48d154d17f479169d49fa0ffca74af453ea5c476579f1fe1d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external websites, masquerading as generators for game currency or hacks. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The presence of multiple links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-live-game-hack In PDF document text
    • https://www.manmed.info:443/images/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/master-game_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-today_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_off000048ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48EF 25268 bytes
SHA-256: 01c1315c2412a0d48c1a41e9a2e820fbe762111a58ca5ebdf7109ab2a36b3e1e
font_01_sfnt_off000082b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B0 18248 bytes
SHA-256: 2e5a72f8344bcf9b425e9fd022f0a9c5c2029812f1a4b00ba9f2a8ee504eb572

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