Malicious PDF — malware analysis report

Static analysis result for SHA-256 5265a67c37978eab…

MALICIOUS

PDF

48.2 KB Created: 2021-06-10 14:18:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eed09de6801792fe7af8101a94594960 SHA-1: a73111990a055aa195175da35c7a0ed41934e19c SHA-256: 5265a67c37978eab99ed62d5ae54bb0040edc7fa8c8dc911b8cb1bdc755b9e2a
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/stigma-roblox-hack-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-legit-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-admin-hack-download_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/youtube-com-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-java-edition-download-free_GM479516143.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_off0000529f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529F 25576 bytes
SHA-256: 42fefca8f7222aee28d74031cb750cc050cb604f490becc86e480097b8170fe9
font_01_sfnt_off00008e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 2824 bytes
SHA-256: 45bf821f81e84f4aa8d8374f492b182b36404f38b462c7dc471deaad6ab5c104
font_02_sfnt_off000097b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B6 18956 bytes
SHA-256: 352c80fa19363f3e247b6df8a3ce7bfc96cbf512fb5f7b727d0edd665f0b5f57

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