Malicious PDF — malware analysis report

Static analysis result for SHA-256 864dba489fd9cefb…

MALICIOUS

PDF

32.6 KB Created: 2021-07-05 15:24:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 65e1924a827d5be8c668fbc771728763 SHA-1: 6a1d48f3c63669994955ba30653fea9611eac9b7 SHA-256: 864dba489fd9cefbd78932528dd356c2e819d2508472dc9c5c99ea9b4080fa29
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 primary URL, http://netcdn.tw/app/431946152/free-robux-test-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to exploit vulnerabilities or trick users into navigating to malicious sites, likely as a lure for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-test-game-hack In PDF document text
    • http://lib.mbp.ac.id/repository/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-recover-a-hacked-pin-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-communism-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/yanisalternalt-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-devil_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

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_off00002d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D21 20996 bytes
SHA-256: c409f3713a750cf99c12f87c4f2a2f503dc54eaf2916f379ec4bdf4fce3bd314
font_01_sfnt_off00005acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACD 18820 bytes
SHA-256: 2eae7dd3a41243ff750ff179cb234be089e9421a2da9af84751e2d625586a030

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