Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89dce43685d0efd…

MALICIOUS

PDF

34.2 KB Created: 2021-07-09 23:56:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 31df2c69cad4824eadb6cd860c9b5e97 SHA-1: eb48ca3fac3884820f10d3be7fef8bb2033525ef SHA-256: b89dce43685d0efd38be98c5455502715bedccb5f4d128a141e57434d68d749b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links disguised as generators for game hacks and free currency, such as 'Coin Master Spins For Free'. These links redirect to malicious infrastructure, including the URL http://netcdn.tw/app/406889139/coin-master-spins-for-free-game-hack, which is flagged as a known malicious redirector. The document's content and embedded links strongly suggest a phishing or scam attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-spins-for-free-game-hack In PDF document text
    • https://tena-g.hr/files/como-solucionar-el-problema-de-shut-down-roblox-al-hackear_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/e-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-doge-hat-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-strucid-hit-box-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-blog-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-retail-tycoon-money-cheat_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-trade-hangout-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-hack-surf-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-a-refund-on-roblox-2021_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
stream_002_off00002e85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E85 23332 bytes
SHA-256: 6dcd146992d371ac512dcbc881138b8dec1f26cb2964654844443f850ee86b09
font_01_sfnt_off00006359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6359 18176 bytes
SHA-256: 9d64f59deaede30a08c34bcec3da02112a68e9d41babb799f745357d62befbf6

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