Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54c7d06d75fd8f8…

MALICIOUS

PDF

36.4 KB Created: 2021-07-03 20:20:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 188c09427bc89da830a6da558ca2d3d7 SHA-1: 6b7ba17eba029e8ce8e8295e0ea2035b96d1dbb8 SHA-256: f54c7d06d75fd8f833cf8d9ea76ec2d1332fdf79704a8f39d2dd85bc9be2f40e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body also contains the same URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence. The embedded URL is likely intended to lead the user to a site that will attempt to exploit them or deliver further malware.

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/coin-master-free-box-game-hack In PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-06-accounts-roblox_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-kohls-admin-house-infinite-edition-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/best-roblox-anti-cheat_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/welcome-to-rbxnow-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-pizza-game-money-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/make-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/counter-blox-roblox-offensive-esp-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-hack-week-2021_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000035b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35B7 23616 bytes
SHA-256: 479d2b5a6bb635602083990a6452d88d95df0f62f874301312a7b9e546654d1f
font_01_sfnt_off00006b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B35 18424 bytes
SHA-256: 06e1a8abdfdbc1378574cba0468ab56135a39765f7a16652ed09c5636b933370

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