Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a42ef2959951f6b…

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 20:37:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8cc4b55b30308f1d44369910279f1810 SHA-1: 3bbdd68ecdce877f934b6aa9ca71e5110c9b86b7 SHA-256: 5a42ef2959951f6bd7b9911412c2e1af51db7d9d5dede52ade540b8e44302254
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's designed as a lure to a redirector. While no scripts were extracted, the embedded URLs and the nature of the lure suggest an attempt to lead the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/479516143/how-to-get-minecraft-on-chromebook-for-free-game-hack In PDF document text
    • http://gamixpaliwa.pl/images/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-free-spins-instagram_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
stream_003_off00004daf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DAF 26168 bytes
SHA-256: 75169e8b30df4f17e2ee982344ddf7b41d834b19f0e0c8dc8fa275676fd36bd2
font_01_sfnt_off000088d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D8 18628 bytes
SHA-256: f21871f293e1374cce8b481ffeffb78eba3f21dd05dabec399dd2d571c50d8ba

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