Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c82d32e8bb3af72…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 18:17:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 76f86d57c9c7e1403673d91e1f8e37b0 SHA-1: 6d73c81226c9ed1ff5994bbb9178d580883b890b SHA-256: 7c82d32e8bb3af72e67d38bfebabf9e98e3358a57d88d90b7d23767cb2760835
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one to 'netcdn.tw', which is flagged as a redirector for game hacks. The document body and heuristics indicate a lure for game cheats and in-game currency, aiming to drive users to external sites. This behavior is consistent with phishing or scamming operations designed to monetize user interest in game exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-get-free-spins-and-coins-on-coin-master-game-hack PDF link annotation
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-hack-boku-no-roblox-to-get-legendary-quirks_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/android-fast-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-roblox-download-on-xbox-one_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-tix-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/get-free-robux-without-playing-games_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-hack-count-easy-of-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/rolblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-black-iron-antlers-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/cheat-engine-roblox-20212021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-find-coin-master-free-spin-link_GM406889139.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/minecraft-apk-download-v1-144-2-free_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_002_off0000335f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x335F 23264 bytes
SHA-256: 332b2a441c152e985df2e6245258ddfbf0160e172587563ad335b45ca7e00d43
font_01_sfnt_off0000682b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682B 18512 bytes
SHA-256: b5acc537c59d1b7fb5e9a8b7451230baa0910c2ee96a0f773c75b2c56351fbac

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