Malicious PDF — malware analysis report

Static analysis result for SHA-256 7837d62bac4926c1…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 10:04:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 945782d6cb1be3df947753a8df6ead00 SHA-1: d84a982a6d288cd228976002e9741f2723df29b8 SHA-256: 7837d62bac4926c14dc96840bdd93b6bd2e5c494448b4259e16bca58cbc383e6
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/minecraft-creative-mode-free-game-hack PDF link annotation
    • http://perpus.wdh.ac.id/repository/how-to-get-free-robux-on-ipad-mini-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/hack-noclip-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-walking-animation-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/be-a-parkour-ninja-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-hack-marshmello-head_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-execute-a-script-with-admin-roblox-free-admin_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/robux-bandit-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-murder-mystery-items-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-hack-no-verification-real_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.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_off00003294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3294 22220 bytes
SHA-256: d262b01afc927ac28d93a34bf11be9e38b24fdcbbecc60e985afac929ae6a57d
font_01_sfnt_off000063ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BA 18284 bytes
SHA-256: a8704dedbd7cd58198964eddd3b6cdb149a158e7fcc2c7dee362bc832501691c

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