Malicious PDF — malware analysis report

Static analysis result for SHA-256 77be106e89c90c8b…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 00:12:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b4cfac03c8cb02b65cdba920f20aefa3 SHA-1: 43718c994d20e767a1cded746cca9e64cdf6e930 SHA-256: 77be106e89c90c8b6b052cbfacc9b7fa6da0365209bb77eee8c3d6a0957551f4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-coin-spin-daily-link-coin-master-game-hack. This redirector likely serves as a lure for users interested in game hacks, leading them to a link farm of SEO-optimized PDF files. The document body and heuristics indicate a social engineering tactic to drive traffic to potentially malicious content.

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.
  • 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.
  • 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/406889139/free-coin-spin-daily-link-coin-master-game-hack In PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/tiktok-free-palestine_GM835599320.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-hacks-free-spins_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
stream_002_off00002ed9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ED9 22576 bytes
SHA-256: 694973c94b3e72629a9249a61f94aa297f22380b51654702df7d2e6912752a6a
font_01_sfnt_off00006151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 18768 bytes
SHA-256: e7ab5634c13e80f3732a4bb55cb72f6aaa71f6432c447f73b6a76ef34b094e98

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