Malicious PDF — malware analysis report

Static analysis result for SHA-256 b877fccfaeecdbc9…

MALICIOUS

PDF

36.0 KB Created: 2021-05-22 07:40:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fcd04f75da8b2ead25a6edd81fcaa68a SHA-1: a35cc390b9d8388ba3b77f6c6aa8cbbe8dc3d4d7 SHA-256: b877fccfaeecdbc9a659db9344761ac49e4a9d1c70a87bbab22acdafab3cdec1
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free robux' lures. The document body explicitly contains a call to action 'CLICK HERE TO ACCESS MINECRAFT GENERATOR' and directs users to a URL associated with malicious infrastructure. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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-server-hacks-game-hack In PDF document text
    • https://itamleek.net/uploaded_files/userfiles/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://itamleek.net/uploaded_files/userfiles/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://itamleek.net/uploaded_files/userfiles/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://itamleek.net/uploaded_files/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://itamleek.net/uploaded_files/userfiles/files/is-it-possible-to-get-free-robux_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
stream_002_off0000326b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326B 25244 bytes
SHA-256: 6b1a9a8732c03a10fd6232dfcd023131f8e3ec3c2618fd62f6d06d4409261731
font_01_sfnt_off00006cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC6 17852 bytes
SHA-256: d08e9f99218473ecffc4f3e4fddc043c571e48cf04331ee5ff23a4dc6866f563

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