Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e094b40a5af4c3…

MALICIOUS

PDF

33.2 KB Created: 2021-07-20 16:20:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 335752ed22aafff294a177f915b0f876 SHA-1: 6f1b5f6b0319e38a780170fbe1e89e7eedabc1c3 SHA-256: d5e094b40a5af4c386d73b5d85bf05166524c3babd2b2ab36891ed4dc9731a25
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The document body and embedded links strongly suggest a phishing or malware distribution attempt. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.tw/app/431946152/free-robux-generator-com-roblox-hack-game-hack In PDF document text
    • http://d-loft.com.tr/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://d-loft.com.tr/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://d-loft.com.tr/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://d-loft.com.tr/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://d-loft.com.tr/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://d-loft.com.tr/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://d-loft.com.tr/images/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • http://d-loft.com.tr/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://d-loft.com.tr/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://d-loft.com.tr/images/minecraft-free-download-android_GM479516143.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
font_00_sfnt_off00002bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BFE 22216 bytes
SHA-256: 3ccbe9795afa5143ce5e79604654f56af7f9954a6f8157f9d4cf30a4a58634ba
font_01_sfnt_off00005d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 19036 bytes
SHA-256: e9298e23474107c7b84722852f71881d4055e6a131595fcbba005770bedde36b

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