Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc8edef96f18356…

MALICIOUS

PDF

42.3 KB Created: 2021-05-23 17:05:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ed96c84ff5fb09995dcb87356fd40a1a SHA-1: 0691ad41e6e8b012d345f12bc178f2a15c6b307f SHA-256: edc8edef96f1835618a97bd1c3171eb8702c6e57d4f48b23dd0804a6ba97b8b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that lead to a known malicious redirector, disguised as a 'free generator' or 'game hack'. The document body explicitly contains calls to action such as 'CLICK HERE TO ACCESS TIKTOK GENERATOR' and directs users to download other PDF files, likely to chain the infection or further obfuscate the malicious intent. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8161

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 https://netcdn.xyz/app/835599320/free-tiktok-likes-no-human-verification-or-download-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-website_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/robux-free-c_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000344b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x344B 24036 bytes
SHA-256: 0881d0e5244ae974c3c6a05724b6e07a9d7af73a36b42d894e4012eaa937fe45
font_01_sfnt_off00006b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6B 3372 bytes
SHA-256: dfbbf67cbc7ecc66ac4d03805ccfff7e5c1407898ea3c5e2b9241b85217ff1cd
font_02_sfnt_off000076ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EC 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_03_sfnt_off000081ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FF 18796 bytes
SHA-256: 3d40c2c610592f010e994df70d6dca89d92a7e9c48723e1cae8d3a563b12c301

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