Malicious PDF — malware analysis report

Static analysis result for SHA-256 1489cbb5c761dd74…

MALICIOUS

PDF

32.7 KB Created: 2021-07-05 13:52:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 754277f7eb40238708e83ad96b8e9b07 SHA-1: a992f3329adc70006108b1fce77830110056a848 SHA-256: 1489cbb5c761dd74c1f80ebe08dab829f0f49b97a2008a2d1991466dbe328f76
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 0.9824

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/406889139/hack-coin-master-for-free-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-enter-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-speed-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-injector-pc-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/safe-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pokemon-go-free-100-iv-map_GM1094591345.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-items-on-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/command-for-test-all-the-roblox-gears-free-admin_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-without-human-verification-2021_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_001_off00002b0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B0D 22752 bytes
SHA-256: 5d4bc9b000f7e6dd70686964c131b908baf650c80d9af44170365b96417d8571
font_01_sfnt_off00005dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBF 18168 bytes
SHA-256: be72a1914a99b846651b156c672e0768d1f742f579973333786d0ab12deac364

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