Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3712f1935f079af…

MALICIOUS

PDF

42.0 KB Created: 2021-04-27 14:47:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0c48ee397ec717b26a16cae0141d76cf SHA-1: 3bd1241e44429643543aa013b4e5c7c445db7e24 SHA-256: b3712f1935f079afc2f5ef0dd04d4ce339676e36c3129e868c7865bdb644a481
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, with one prominent link leading to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for 'game hacks' or 'free generators', suggesting a social engineering tactic to trick users into visiting malicious sites. The presence of multiple redirector links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/431946152/how-to-hack-roblox-tycoons-game-hack In PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-skin.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-stuff-on-roblox-catalog.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-login-free-account.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-flood-escape-2-hacks.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-roblox-rigs.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-hair-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-gift-cards-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/change-org-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/hacks-impulse-testing-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/download-games-to-get-free-robux.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004395.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4395 26936 bytes
SHA-256: e96d81a93c340b3215acaa554d3fefe04005ef2aa00241cd50a5c9d663b53f5d
font_01_sfnt_off000081b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B7 18528 bytes
SHA-256: 3f4c539d0c9c63f2d85bca40f4249f4a03696c1dce446edfa22c292dc2b4f7df

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