Malicious PDF — malware analysis report

Static analysis result for SHA-256 967b789a7a53a643…

MALICIOUS

PDF

31.1 KB Created: 2021-07-19 10:20:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e39420c94d1cfe3017b6a8d58b11be42 SHA-1: 1ea39185edcdff1ca7dd61f5e2d58534f971baed SHA-256: 967b789a7a53a64331ba955c76fc4f1085c5a8e618f8bad457274e6153ca3982
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, specifically advertising free game hacks and currency, which is a common lure for malicious content. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. While no scripts were extracted, the embedded links and the nature of the lure suggest an attempt to deliver a second-stage payload, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9387

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/479516143/minecraft-pe-free-game-hack In PDF document text
    • https://steelfurniture.vn/public/upload/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://steelfurniture.vn/public/upload/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://steelfurniture.vn/public/upload/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://steelfurniture.vn/public/upload/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://steelfurniture.vn/public/upload/files/how-do-you-get-free-robux-on-roblox_GM431946152.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_off00002795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2795 22484 bytes
SHA-256: 1242b2a1dd088ecb9c26ff98f144dab6c2da04becbc3a3c38b80e9fc2159fc45
font_01_sfnt_off00005996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5996 17724 bytes
SHA-256: f623db3d5896acbfca75c1fa71b49e9ae1d6d1c000a87567f3c2fb9ea3a364ca

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