Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeda588405834b61…

MALICIOUS

PDF

46.7 KB Created: 2021-05-12 04:35:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 754f1639833502c609b2c1fc05ec6a67 SHA-1: ec5476340bea0fe0b17b015cf4ecf18b49ac20f8 SHA-256: eeda588405834b61123121f12ae0df81a8a775cce8c533f5aa1c2a2ebbb74387
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 0.8948

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.xyz/app/406889139/coin-master-hack-apk-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-instantly_GM431946152.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_003_off00004a40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A40 28848 bytes
SHA-256: 4a4bea3450a604f7e4b0d17d82989b1ab4bdee9382477004cd53b5a815fecb9d
font_01_sfnt_off00008a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A16 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9540 17892 bytes
SHA-256: f939fda97690d6a809d743b342add8ec97984f5e978608423f32dd39679c4d64

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