Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df3631543de6aa…

MALICIOUS

PDF

35.1 KB Created: 2021-07-08 13:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 957a9e795b799f3ee2e2fc977832ab19 SHA-1: fbc2d5a9770180ac8e88c6c0d1141d4f7c459514 SHA-256: a8df3631543de6aaaf69949c8cf6b80ee4dd74f55fd79ecd50156d7fbd691a26
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to game hack generators and free item downloads, a common lure for users seeking cheats or exploits. One link points to a known malicious redirector, and another uses a raw IP address, indicating a high likelihood of malicious intent. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution attempt.

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-hack-2021-link-game-hack In PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/checker-script-hack-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-bedwars-2-on-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-money-on-roblox-tycoons_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-free-pants-and-shirt-president_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/est-il-facile-de-hack-sur-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/cheats-for-roblox-ios_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/impact-roblox-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-jailbreak-money-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-now-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-roblox-autofram_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/daily-coin-master-free-spin-link_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
font_00_sfnt_off00003257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3257 23044 bytes
SHA-256: c2d335f2df34e5ce6bdeec23bffd29eb175c41201b2afff3f96aa396458b48cf
font_01_sfnt_off00006609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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