Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77cd1b0ad8416be…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 12:31:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 64e9186fb6e6b0f1d4fbb20466fcc81f SHA-1: 936fd745939bfbe5b3bfdcc2d90783591082620c SHA-256: b77cd1b0ad8416be708d04414635cce10d8df958355a50e40434d7dbe4f80b90
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/roblox-free-robux-no-human-verification-game-hack PDF link annotation
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/critical-strike-roblox-free-gamepass_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-escape-games-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hacker-roblox-t-shirts_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/robloxs-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/robux-hack-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/el-mejor-hack-para-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-place-uncopylocked_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-amby-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-hack-accounts-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-hack-menu-jailbreak-2021-abril_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/download-a-free-gater-for-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hack-followers-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-hack-roblox-servers-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-use-robux-hack_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_off00002fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA0 22232 bytes
SHA-256: c81055a7efdb12616d88920d0b34ccfaeb14b71c55875b61ec7bdc04805c5d7d
font_01_sfnt_off0000610b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610B 19408 bytes
SHA-256: d2ef309b92771ae7bb099a6b634574daefb8445dd777fce633f2a8c245e3903e

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