Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b1d84cc056358c…

MALICIOUS

PDF

37.1 KB Created: 2021-06-28 16:04:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c85e139929e9c30a87989916c54a064 SHA-1: 24d13325b1a7e2b24cf296b36f5c6310916c8d90 SHA-256: d1b1d84cc056358cc091a9363d3d6bf4719b79bd71a6d677725d43f08de3b3aa
160 Risk Score

Malware Insights

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

This PDF document contains multiple links, including one pointing to a known malicious redirector at http://netcdn.co/app/431946152/hack-roblox-robux-with-root-game-hack. The document body and heuristics suggest a lure for users seeking game hacks or generators, likely leading to a malicious download. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.co/app/431946152/hack-roblox-robux-with-root-game-hack In PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/hack-de-allahu-akbar-roblox-download_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/block-best-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-no-human-verification-or-scams_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/gamefreaksz-co-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-hacking-menu-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-free-box_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/tiktok-free-credit_GM835599320.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-hack-someone-roblox_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 3

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_off0000397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x397F 22328 bytes
SHA-256: dd4781da2f3e1ff1c79df17cde478c14b8f5744416970483ee46bcc2d95308cf
font_01_sfnt_off00006b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B13 19384 bytes
SHA-256: 772f701aa636b2bf8084c91722d15cded20d197dffbec088679670cc54c3bc6d

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