Malicious PDF — malware analysis report

Static analysis result for SHA-256 543ed2b2c1506eca…

MALICIOUS

PDF

45.0 KB Created: 2021-05-10 21:41:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bef70fd34c1213e3fb79da01513e0dc6 SHA-1: 809828139ed13466608dbe5accff4fc130336795 SHA-256: 543ed2b2c1506ecaf9c62d9fde7d59ce5d0b6c8273b1992e6db4168ed626b4b6
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 0.9632

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.xyz/app/406889139/how-to-hack-coin-master-game-without-verification-game-hack PDF link annotation
    • http://perpus.poltekeskupang.ac.id/repository/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ad5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD5 24500 bytes
SHA-256: f7c382507633e1bf3778124233481ca5aef2484bda44da059b07d214a9469947
font_01_sfnt_off000081fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FA 2884 bytes
SHA-256: f9d1f73c99ac19e1fa9dba4eb5e90eabc47451d72c930a2b8abf3a4aec2ebdc9
font_02_sfnt_off00008bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDC 18780 bytes
SHA-256: 446fbf78453caea82e2f70aa7ea03bb5f18f2883ceecb63ccf230612f743af2c

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