Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2342ee79ed871ef…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 08:42:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9b913e4bc9994633db7ff4b9f57b7f76 SHA-1: 3554b81099ff7b906b89abc4e33c6e4d34eb2508 SHA-256: f2342ee79ed871ef9af3b2c38b5cdbff39f64cdfc57458d371b5a49d66b07fce
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 0.9865

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.online/app/406889139/how-to-get-free-unlimited-coins-in-coin-master-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/tiktok-free-like-and-views_GM835599320.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/earn-robux-com_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-any-face-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-roblox-premium_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
stream_004_off00005365.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5365 24852 bytes
SHA-256: efbe69b5cc383301180a4bc516473a6fc76825e1444fa67a6f212c75865d5208
font_01_sfnt_off00008bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB8 18568 bytes
SHA-256: 17c3bfe6e2b09087d9b288dc5214e8ea6d8a39f73936503e3f6998c4d0212d6e

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