Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb9ec0c93bada77…

MALICIOUS

PDF

41.0 KB Created: 2021-05-22 22:34:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 036a51d20180ba6d83d3a0793f6c22cf SHA-1: cb442b7d7e054e419a8fd0e4daf2e50d03d84d55 SHA-256: 5eb9ec0c93bada77d79c0c3fbd64645e0baab154ff8aaa51f04b9ed86eca9e91
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, including one identified as a malicious redirector leading to a "free generator / game hack" lure for Minecraft. The document body also contains similar lures and calls to action. The ML classifier and heuristic firings strongly indicate malicious intent, likely to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7508

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/479516143/minecraft-login-free-game-hack In PDF document text
    • http://yochin.org.tw/images/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A1 29628 bytes
SHA-256: d0eb0d939a12452163f18bd550d443a0730f27c5ea91063c907864199814e144
font_01_sfnt_off000075a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A5 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00007fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA2 17996 bytes
SHA-256: a07e2ad8fd79bb30e6fc1ebe6b3b8a9b32aa8410594bf0891ac0147b7718a067

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