Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4b901e29463f99…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 19:52:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b4bbf2faae5a177129a81f16129a2091 SHA-1: 9c87e9cce66cc981260352c9ba7f7d7a94509401 SHA-256: fd4b901e29463f99e7cc4850ba727a921f1831d5b8786dffc2b915c5d1cd5d15
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 0.9980

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 http://netcdn.tw/app/479516143/free-minecraft-premium-account-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk//repository/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-shirt-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-unlimited-robux-by-hacking_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-but-with-ransomware_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pokemon-go-free-online-play_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-no-hack-or-anything_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/cheats-for-blodody-mary-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-games-for-girls-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/gui-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-pe-free-download-ios_GM479516143.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_off00003587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3587 21920 bytes
SHA-256: afa7cc3a13d40a7f9222886cb0534337192a9417cff3cef9ac206b110c690332
font_01_sfnt_off00006563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6563 18552 bytes
SHA-256: 335ad5bd11d1b5490beeffd4b04e426b92c3c8588cbb26eb3dbcf918d515cd86

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