Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1e71ff6fece776…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 22:23:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bba1e6c59dff3f5c478526fbe7aa0a7b SHA-1: d7b9682b308d87675023ceef71de6bd508dae150 SHA-256: 5a1e71ff6fece776b7b6250978604d5feedfe43b4cd10483b150eda3b6b9a3b4
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector hosted on netcdn.tw, which is flagged as malicious and associated with game hack lures. The document body, though heavily obfuscated, contains references to 'free game hack' and a URL that aligns with this lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/gear-in-roblox-free-game-hack In PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/roblox-source_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/roblox-cheats-to-get-2021-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/roblox-verification_GM431946152.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://www.rajmahalproductions.com/uploaded_files/userfiles/files/minecraft-hack-download_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
stream_004_off00005466.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5466 25392 bytes
SHA-256: bf300a547f689c9203d41e5d1caa6dc9dad7c6fac637c64560678a46319f2159
font_01_sfnt_off00008efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFD 18176 bytes
SHA-256: 0269d785c20f0902865ce49efd17ae330776f74b1b6347b04dc49868e889c910

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