Malicious PDF — malware analysis report

Static analysis result for SHA-256 2041837c5c32fbed…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 11:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3844af1230ae7a02370efcaed66e20aa SHA-1: 5f5c4cb4d21534fc43b75335f8d0a0550a4fb892 SHA-256: 2041837c5c32fbed703e11dd30c6ed770e27816ae21e5fbba7b51a8447da57a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that lead to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-roblox-printables-game-hack. The document body and heuristics indicate a lure for free game-related items, likely a phishing or scam attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-roblox-printables-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/free-roblox-promo-codes-2021-april_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-followers-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/discord-server-how-to-hack-a-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/online-games-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-hack-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/shirt-roblox-template-free-shipping_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/best-free-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/gampass-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/competition-for-free-robux-no-lie-still-on_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-model-purchase-request-roblox-spam_GM431946152.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_off00003379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3379 22616 bytes
SHA-256: f2bf3a5519ef8517d0621ce689b04760b1f8ab178855578702b4d72128f2898f
font_01_sfnt_off00006611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 19028 bytes
SHA-256: 1b1bed31e01b267d37930b89e407ed752ed8ac45c73a01641f66f0431698b544

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