Malicious PDF — malware analysis report

Static analysis result for SHA-256 71366a995c13dd2f…

MALICIOUS

PDF

41.3 KB Created: 2021-04-28 22:06:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f24aba9f8d33bf5f6562bca1a853fe58 SHA-1: 706871f3b0885f4953db1f35e00fc469d6cbec23 SHA-256: 71366a995c13dd2fad8a4d7ca4a8746ef4a4720719b58f08d34aca1407fb9ecf
160 Risk Score

Malware Insights

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

The PDF document contains lures related to game hacks and free currency, directing users to malicious redirectors. The heuristic PDF_GAME_HACK_REDIRECT_LURE specifically identifies the lure and the malicious redirector infrastructure. The embedded URLs and the document's content suggest an attempt to trick users into visiting potentially harmful sites, which could lead to credential theft or further malware infection. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/431946152/roblox-cheat-codes-for-robux-2021-game-hack In PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-list.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-hack-for-android-apk.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-obby-limited-time-only-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-on-ipad-pro.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/how-to-get-free-robux-without-a-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/no-virus-hack-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-piano-hack.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-xbox-one-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-hack-no-verification-or-survey-2021.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_off0000426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x426C 25880 bytes
SHA-256: a1f868ce1b0ef5f18051301b156b030bb97cd45236388ed77c02c980bc343298
font_01_sfnt_off00007d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0A 19160 bytes
SHA-256: ecba2fb9aa5f95ec1295b85954ddf26f2fe7c55bfbbf0d89cbedb2e4105025b3