Malicious PDF — malware analysis report

Static analysis result for SHA-256 2559ed937437bf9b…

MALICIOUS

PDF

42.8 KB Created: 2021-05-12 09:06:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ee277a8bbb5710a1e9343fbb96a0ed63 SHA-1: 463a78eaad2c6ef4a6fc828ea49f728c747aebcb SHA-256: 2559ed937437bf9b063468ef7c49b8b8176c4e32d24573ae2b8607b6e92d5471
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and multiple links to known malicious redirectors, including one that promises a "free Robux" generator. The primary lure appears to be a game hack or generator, directing users to `https://netcdn.xyz/app/431946152/free-robux-only-1-step-game-hack`. The document body also contains obfuscated text and references to the same URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/free-robux-only-1-step-game-hack In PDF document text
    • http://oddgraphic.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://oddgraphic.com/images/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://oddgraphic.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://oddgraphic.com/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://oddgraphic.com/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://oddgraphic.com/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://oddgraphic.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://oddgraphic.com/images/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://oddgraphic.com/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://oddgraphic.com/images/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oddgraphic.com/images/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://oddgraphic.com/images/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://oddgraphic.com/images/robux-com-roblox_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_003_off0000494f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494F 25272 bytes
SHA-256: a35c80568b94bd21a22b7da3cbfb0f517e0823ab4094056776bdc892ae382cae
font_01_sfnt_off000083a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 18656 bytes
SHA-256: 070bf31dcf9002553526675ed1cd7b39f0747279791c235f0424fbc506b236c5

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