Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c5ec1c496550d4…

MALICIOUS

PDF

47.5 KB Created: 2021-06-09 15:56:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2c5796f9730354057c5faf4cca479398 SHA-1: 514cfa3b2dc669f2802338248a091ed05322b648 SHA-256: b2c5ec1c496550d4810079bc7eec28eba7187b64a1a2d228b84e47f48e4b82dd
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.tw/app/431946152/roblox-guess-the-famous-characters-answers-cheat-sheets-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/casini-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/pubg-uc-logo_GM1330123889.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/1-step-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-hack-generator-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/without-pokemon-go-free-incense_GM1094591345.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/wurst-client_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hacks-for-iphone_GM406889139.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_off0000539a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x539A 28716 bytes
SHA-256: 37dd32eaa18954e7afedbf422227f9a7c155ebf0a7888fb004f2046c565a6b7c
font_01_sfnt_off00009501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9501 19008 bytes
SHA-256: c189edbaf02c0f3e30f93885a19fa0b91891b19fa0a94cca71b6026a2c4e9cea

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