Malicious PDF — malware analysis report

Static analysis result for SHA-256 578b224e03a330c1…

MALICIOUS

PDF

34.9 KB Created: 2021-06-19 07:57:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7dcfc95f86c356b18a17ca41387763f8 SHA-1: 06079f3054eb588251a3f54e48260ee4bc9b392d SHA-256: 578b224e03a330c1be64fc891c11f7c1909a6d96c36620f08d0f5608dbf63dfa
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.co/app/431946152/roblox-com-free-for-mobile-24-com-game-hack PDF link annotation
    • http://library.stikessuakainsan.ac.id//repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-vip-server-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/yt-fmm-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/why-pubg-uc-is-expensive_GM1330123889.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/hack-roblox-robux-code-de-triche_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/microsoft-rewards-roblox_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_off0000302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302A 22452 bytes
SHA-256: 89a36adb3764a1d1086ce1bfcebce169eb659fddc9475f353a4430a9c9915f13
font_01_sfnt_off00006281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6281 19412 bytes
SHA-256: 8177cdc47a925baf526ff90ab316a43270e3ec7628583cb4755c03c195204ee8

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