Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a11697b565bece…

MALICIOUS

PDF

41.3 KB Created: 2021-04-24 15:18:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e464a4abf3955110736c29a47505780b SHA-1: a5785776f47195503e340377f2322538a27acb77 SHA-256: a7a11697b565bece795213c7bff077f45b14ddbc45f6126c6296995eff842acb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, disguised as a 'free generator / game hack' for Roblox. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to the malicious URL and other PDF files hosted on a potentially compromised domain, suggesting a phishing or scam attempt.

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-download-android-free-game-hack In PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/free-robux-no-human-vertificc.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/roblox-how-to-get-free-items-2021.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/free-roblox-redeem-codes-2021.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/roblox-free-hair-codes.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/free-robux-without-verifacation.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/hacks-for-roblox-ro-ghoul.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/hacks-para-tener-aimbot-en-roblox.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/ninja-legends-hack-roblox.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/how-to-hack-into-peoples-accounts-on-roblox.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/roblox-free-hats-obby.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_off00004203.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4203 26480 bytes
SHA-256: 74901689a3beccb864863231cdb96e54800aa0cc21f358304f4e56f202fd9166
font_01_sfnt_off00007dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFD 18804 bytes
SHA-256: 2e8356f366db8f2666cc7c05484bc34f2561bfc95c5ebd065685abb2fba5818c