Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bf74679a1981da…

MALICIOUS

PDF

40.6 KB Created: 2021-04-27 09:18:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1b504ef86666ca335348e57aead0a852 SHA-1: 1328e3831e1076496d71f4f31d997f1ee146f10c SHA-256: a9bf74679a1981da710120ade09c788c38e001894b44bbe90b96f065fcfe48ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically disguised as 'free generator' or 'game hack' lures. The primary redirector URL is https://netcdn.xyz/app/431946152/free-robux-codes-list-pastebin-game-hack, which is designed to lead users to further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attempt to drive traffic to malicious sites.

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/free-robux-codes-list-pastebin-game-hack In PDF document text
    • http://www.saburai.ac.id/elibrary//repository/robux-earn-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/daily-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-faces-on-roblox-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-frappe-hacks.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/cheat-roblox-apres-la-dernire-mise--jour.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/free-roblox-toy-redemption-codes.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/create-own-free-skin-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-shard-online-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-skin.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_off00003f93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F93 26744 bytes
SHA-256: e5aa56f6862844603cab1b73f5d704e2bde99870f1b7339f6b9354bfed44e6c9
font_01_sfnt_off00007b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B33 18796 bytes
SHA-256: bd841189766faba568df86e4e4d0c92a19bf285c0a8d82d4130f1f78332d3a69

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