Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb12d3bae6e91733…

MALICIOUS

PDF

42.4 KB Created: 2021-05-14 12:31:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 721a33517cd02e09ac96cd3bc4215ba3 SHA-1: 440b32d936d25ec59e9f278ae0ac988cab3017e6 SHA-256: fb12d3bae6e91733c19285e47f1501ecfdfffe299b525ca0170d026f680ca0b4
130 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free Robux' and 'game hacks', directing users to a known malicious redirector URL. This indicates a phishing or scam attempt designed to trick users into visiting a malicious site, likely to deliver further malware or steal credentials. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-get-free-robux-easy-hack-game-hack In 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_003_off00003398.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3398 28684 bytes
SHA-256: 64afb8de844b8cbf35ea8556050ccf7b078a4b07cfe19fc55ca15e993aea3bc2
font_01_sfnt_off000075af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AF 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000082c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 18860 bytes
SHA-256: ae4481784f2b59baf7f887bcc8933de4398304efe668e0a39e1c63b4066a7356

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