Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92c76f744f3931c…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 06:09:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1b07ff0c894d75022214abc515af768a SHA-1: 73d28e229d486fb84d2e526f2e2345ad8abf83cd SHA-256: b92c76f744f3931cc7473424dd2dac9d5a41ccfbf8bc93f2735e4fdc68118f48
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/431946152/free-robux-working-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-catalog-hack-pastebin_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-cute-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-in-roblox-waitseds-no-time_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-dayz-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/pokemon-go-free-promo-code_GM1094591345.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-roblox-hack-no-survey-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-robuxfor-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-download-for-pc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/escape-mario-area-51-roblox-game-download-free_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_off00002fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFF 22272 bytes
SHA-256: 4e51d02529905a2d687f34655688de30828e12749b0dc9e84d75d6c937eb6e23
font_01_sfnt_off00006173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6173 19204 bytes
SHA-256: ce738487085ad599441484df9d90a1a143049edc5affa9a85a5d558c4f13480e

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