Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d651473194ffb38…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 19:16:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3acfefbaa1ffb1df1f36dca7258dfa17 SHA-1: 516ddd4c901c876c5979d6f536e152f9f32c9b46 SHA-256: 5d651473194ffb385fe59a179481b7c041004957c3fb8d70606454a55ede21cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/free-spins-coin-master-facebook-game-hack. This redirector is associated with lures for game hacks and generators, suggesting the document's purpose is to trick users into visiting malicious sites. The presence of a visual download button further supports this phishing-like lure.

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/free-spins-coin-master-facebook-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/robux-offer-wall_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/group-give-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hide-and-seek-free-online-game-for-kids_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-shirt-templates-roblox-lyon_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cheat-files-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-prison-life-in-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-oof-sound_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cheat-codes-in-work-out-simulator-in-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-person_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hacks-para-roblox-descargar-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-apk-hack-uptodown_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_off00002fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA9 22628 bytes
SHA-256: 2a403cf5b3310ab750c8e18ff8c98fcddd03cf905703cc53ad3f9437ab470a4d
font_01_sfnt_off0000622c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622C 18504 bytes
SHA-256: cd54949ebaef5849fc85f109f73d9d11112ecbf4734953d8e6d9505d542a0608

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