Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dcb594521f784a…

MALICIOUS

PDF

35.4 KB Created: 2021-06-30 05:44:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f8488f081cbc31a299dc89d1080ee188 SHA-1: dcd4e2571b2ab34c1969d6517336d383e9c22f6d SHA-256: 16dcb594521f784af9d98619165a738b64f3d47803de8453901bd99be370ebf0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.co/app/431946152/hack-roblox-simular-click-raton-game-hack. The document body and heuristics suggest a lure for game-related cheats or generators, which is a common tactic for distributing malware. The ML classifier also strongly indicated maliciousness.

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.co/app/431946152/hack-roblox-simular-click-raton-game-hack In PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-payment-exe-download-free_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/2021-bt-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-free-tix-2021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-upload-your-own-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-how-to-make-audio-for-free_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-level-6-injector-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-executor-free_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-exploits-2021-free_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-supreme-roblox-model_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

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
font_00_sfnt_off00003032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3032 23212 bytes
SHA-256: 9a783354c4bc0dc2e6def729ecabe16574000963eaf20a7b4af0f31695ac09f5
font_01_sfnt_off000064be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BE 19280 bytes
SHA-256: 52cda177ebc585dad7fdfd69468621e67569ae7ca92efc906ff5f622ae4cad22

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