Malicious PDF — malware analysis report

Static analysis result for SHA-256 381a02c3424c7b94…

MALICIOUS

PDF

41.6 KB Created: 2021-04-24 16:00:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cfb2e0bc3b491ff0cf8650b8414d6e67 SHA-1: cd3af64a283fe7ee71b6fce139d4ed1eb9b22bf6 SHA-256: 381a02c3424c7b94f9119d39083453b4653677f10de9d6d6c6a63913c01f7571
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, disguised as a "game hack" lure. The ML classifier strongly indicates maliciousness, and the malformed stream suggests exploitation. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/dungeon-quest-roblox-hacks-script-game-hack In PDF document text
    • http://sudamericarural.org/images/how-to-get-free-robux-lohith-gaming.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-hack-nonsense-diamond-download.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-free-robux-2021-march.pdfIn PDF document text
    • http://sudamericarural.org/images/auto-click-on-roblox-hack.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-account-free-robux.pdfIn PDF document text
    • http://sudamericarural.org/images/hero-havoc-roblox-hack.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-complete-free-hack.pdfIn PDF document text
    • http://sudamericarural.org/images/free-100-robux-code.pdfIn PDF document text
    • http://sudamericarural.org/images/fnaf-roblox-fread-bear.pdfIn PDF document text
    • http://sudamericarural.org/images/battle-royale-roblox-hack.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_off00003c46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3C46 30092 bytes
SHA-256: 0405b0472b0eeabb18c8f92a6b5ea159e58e7d3165c712863e636fb415b7bfca
font_01_sfnt_off00007d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D92 19336 bytes
SHA-256: 795eb1ebb2cfcdd97121f60dc671456b13a54c080bd92256f6615bb9c6e8824e

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