Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3a6b51ac32e550…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 12:04:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e676779763e60fa9ce52b1f4a50deed SHA-1: 809022ebcd2c3ed2a6c681dc7b5d81c98415ce97 SHA-256: ed3a6b51ac32e55047e0c01e99e0a265ac206caec9478ad2430794b2c08b288e
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/406889139/bit-ly-coin-master-hack-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-and-tix-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-and-bp-free_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/counter-blox-roblox-offensive-hack-download-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/where-tiktok-free-views-app_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-radio-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-mod-version-free-download-ios_GM406889139.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_off000031c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C5 22420 bytes
SHA-256: aacbab63d804a219ed6d5e6d3aee86cbbcd68f357e1d3aa615f81fb1c4df0922
font_01_sfnt_off000063a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 18400 bytes
SHA-256: 08e084bc68f1772533343ed38c474e1cd091c3312d1d99c850c2987ca26900e9

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