Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d60ca94e3837db0…

MALICIOUS

PDF

36.0 KB Created: 2021-07-09 08:52:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 977f121e5bd95227b68dd9a6a56d563d SHA-1: a4f056c16696d7c73d2e36fb112324fb10bf5525 SHA-256: 1d60ca94e3837db0f46b1eb8a3943dabe537a154e06b0a85f45ebc218cfabfbd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/how-to-get-free-robux-without-human-verification-2021-game-hack. The document body and heuristics indicate a lure for 'free Robux' or 'game hacks', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/how-to-get-free-robux-without-human-verification-2021-game-hack In PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-no-downloads-2021-real_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/how-to-earn-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-items-on-roblox-names_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-phantom-forces-hack-client_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-no-offers-no-human-verification_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-roblox-royale-high-diamonds_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-no-verification-or-survey-or-download-2021_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_off00003249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3249 22444 bytes
SHA-256: 4125ee40c95fdf0526383a9bf2914c0fd6c27d2404f30364cad660928f2d9362
font_01_sfnt_off000063fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FD 20264 bytes
SHA-256: 26aa4917e1153719256d6dd4d07c71b39b84df2f774e0169f128f53eab8dbbb8

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