Malicious PDF — malware analysis report

Static analysis result for SHA-256 856d59ddb731f0da…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 08:43:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5477102efa59f931b5197b2d5e33d802 SHA-1: 73db98d3eedbb0e09c75d74abdfd6acae57542a8 SHA-256: 856d59ddb731f0dacff6f9eff58529877ff2fb1bc4a91fb50d25ad944da5eaca
160 Risk Score

Malware Insights

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

The PDF document contains a lure related to game hacks and free currency, directing users to a known malicious redirector at http://netcdn.tw/app/431946152/how-to-get-roebucks-game-hack. This indicates a phishing or scam attempt designed to exploit user interest in popular games. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/431946152/how-to-get-roebucks-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-gamepass-on-roblox-phone_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-is-being-hacked-9-21-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/make-free-robux-com_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/70-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-no-videos_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/tiktok-free-or-not_GM835599320.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
font_00_sfnt_off00003144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3144 22396 bytes
SHA-256: a299a9d910a36b01947eb84477e637274a8021c969bf2e3ec37f47fa41870a10
font_01_sfnt_off000062d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 18780 bytes
SHA-256: cbc4d9ca89efa05c36d0990942cb8c95bcf8b482279d0344eae9b58d23f39d2a

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