Malicious PDF — malware analysis report

Static analysis result for SHA-256 af90c694e154b4e6…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 10:28:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 24aea5670fd194d9f1132ebb0b018fbe SHA-1: af44c85f3414f331509ba446fbbb7d213656531e SHA-256: af90c694e154b4e6eec51c5808005406f471fc9218c283a1f9ed3d3a38334be5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' for popular games. The primary lure is a link to 'coin-master-hack-ios-without-verification-game-hack', which is hosted on netcdn.tw, identified as a malicious redirector. The document body and numerous embedded URLs reinforce this theme, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF's structure and embedded links strongly suggest a phishing or social engineering attack.

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-ios-without-verification-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/is-hacking-roblox-legal_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rewardex-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-a-mythic-for-free-in-assasin-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-four-free-items-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-hacker-mask_GM479516143.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_off00003191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3191 21892 bytes
SHA-256: ea3304895353b5bc4d8b636a1e6c25d8babc3eaf224dd7807321506c88965af9
font_01_sfnt_off000061e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E4 18640 bytes
SHA-256: d09c8106661f74f305047918f35c4275d219565236fc2df077770cf36396860a

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