Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a2ea0f38f08b61…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 00:51:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fa2b690c96db4e2e51b2af1a31afeaca SHA-1: d736d5ee85c21301bc8c1bb2e04da45df855866f SHA-256: e8a2ea0f38f08b61879b74dcdec2316e1908eadf304e1a552e26ef7a5ea653a1
180 Risk Score

Malware Insights

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

The PDF contains a malformed stream and links to a known malicious redirector infrastructure, specifically advertising free game hacks and currency. The ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a lure for users seeking in-game advantages, which likely leads to further compromise or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://netcdn.co/app/431946152/free-roblox-place-visits-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-robux-hack-no-survey-or-verification_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-do-i-hack-robux-by-myself_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-skateboarding-game-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-admin-commands-roblox-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/phantom-forces-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-hack-deutsch-auf-pc-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-hack-on-roblox-com_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/100-free-spins-for-coin-master_GM406889139.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
font_00_sfnt_off00002eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB0 22564 bytes
SHA-256: 48623ee3b3460ac616c35dcc88e2705efa3cd93d862d23794511c7e4bf7093fa
font_01_sfnt_off00006126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 19164 bytes
SHA-256: ec29d5a569af665ac779007958edf9c16a35a5085ed8e841f96daa14fc0d31e0

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