Malicious PDF — malware analysis report

Static analysis result for SHA-256 531f3fa99458d3e7…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 11:34:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: abe4cd9e8f4de660397d8021fde2961b SHA-1: f51a0cfbe2a6d5c5b93bea49e013fd68a990505d SHA-256: 531f3fa99458d3e756fcd63e7ea911f7eca534295ed04ef04ddca35a9fc1f1ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and game hack lures, aiming to trick users into visiting potentially harmful sites. The document body explicitly mentions 'Coin Master Hack Online 2021' and includes numerous URLs pointing to sites offering 'free robux' or game hacks, indicating a phishing or scam attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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-hack-online-2021-game-hack In PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/savagery-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/racist-penguin-roblox-hack_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-roblox-noclip-hack-no-download_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/adonis-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/roblox-wings-free_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/can-u-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-hack-robux-on-roblox-2021-mac_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/como-ser-hacker-en-roblox_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_off00003015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3015 22240 bytes
SHA-256: 44b56b61cce7d548ef5a62624d0402f76b5e7ba2e2d45f294e0f3cdf89e2cae0
font_01_sfnt_off0000615e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 18480 bytes
SHA-256: ef82715271ba1f94a45d6916d2ee21c9679af0e81bde34cb0f9ffa05e7cff0da

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