Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3aea4489638176…

MALICIOUS

PDF

44.9 KB Created: 2021-05-19 19:47:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c986bb8953ef6fd300ec7a02f3b180b6 SHA-1: 672a4c5860aae759ac500a121689d0ebb37f9052 SHA-256: 4b3aea4489638176a20c1fc53874f09daccf7de8bb27c4cb3355b9ce03bbadd7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game items, directing users to a known malicious redirector. The document body and heuristics indicate a phishing attempt designed to lead users to potentially harmful content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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.
  • 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/406889139/coin-master-daily-free-spins-and-coins-game-hack In PDF document text
    • https://www.laarsenco.nl/images/real-robux_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.laarsenco.nl/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://www.laarsenco.nl/images/can-pokemon-go-free-pokeballs_GM1094591345.pdfIn PDF document text
    • https://www.laarsenco.nl/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.laarsenco.nl/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://www.laarsenco.nl/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://www.laarsenco.nl/images/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • https://www.laarsenco.nl/images/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/robux-place-rewards_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • https://www.laarsenco.nl/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://www.laarsenco.nl/images/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.laarsenco.nl/images/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • https://www.laarsenco.nl/images/what-is-a-minecraft-client_GM479516143.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_003_off00004a31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A31 24884 bytes
SHA-256: 9619f50aa46f8eabe5120537bf6f88e329c5fbced7dec438bc913e799b3179c0
font_01_sfnt_off0000829b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4C 18480 bytes
SHA-256: 323fea871d3154f9ddf991b22fd859b77165b4ee4e2d03de0fe4666202988bbb

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