Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aef4ed4b70d5698…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 02:18:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e519cf5973c654aba53ccc00a2728407 SHA-1: 206a0044ac091a5391cf1c2482b7e15f03b88607 SHA-256: 6aef4ed4b70d5698ae23538481b86bedb3967fe36509265d66a19155d24f6497
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 0.9796

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/how-do-get-robux-for-free-game-hack PDF link annotation
    • http://dismarinamt.com.br/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-no-human-verification-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/roblox-dragon-ball-rage-stats-hack-phezii-br_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-spin-link-coin-master-app_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_004_off000054b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B7 25116 bytes
SHA-256: bbf24c00b18126f0a4b0c8b11d500a6853bc88820c3faf37a9d6b2e0c72c732b
font_01_sfnt_off00008ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF2 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off0000a062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA062 18452 bytes
SHA-256: 0f676835d608a9bd11dcbb1b110822e228082d0fec98b04347c05536e44bcb2f

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