Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee12661893b4d59a…

MALICIOUS

PDF

47.4 KB Created: 2021-05-15 22:45:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a8630b575efe050aa4f24d79ae9fe5a8 SHA-1: 861a23476b376a8baf427b7aab018008da6a26f8 SHA-256: ee12661893b4d59af3cf9e28a995be4a14b95c57e07ba7196c75ad46a5f47b5d
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 known malicious redirector infrastructure, specifically advertising "free Robux" and "game hacks." The presence of a visual download button and the overall lure suggest a phishing or scam attempt designed to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF's structure and embedded links indicate an attempt to exploit vulnerabilities or redirect users to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/can-i-get-robux-for-free-game-hack In PDF document text
    • http://indotec.fr/images/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://indotec.fr/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/robux-match_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://indotec.fr/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://indotec.fr/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn 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_off00004bf8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF8 26304 bytes
SHA-256: 0be63faf948c42ee38b54a38b0e35ec2907d608093838cb5943700c93e1f01a4
font_01_sfnt_off000089df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DF 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9686 18344 bytes
SHA-256: 56a64ad9af2fab004080c55c49ec35472f3c2134e95e40197be892b268dd39d5

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