Malicious PDF — malware analysis report

Static analysis result for SHA-256 908819750967aff9…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 05:34:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6466880c39e00b4268894675fe972d22 SHA-1: 4f0b59cde913788e62998fd78fc12074c9d641d3 SHA-256: 908819750967aff9de82d59a0042e98f389034637b22dccadf42ffeb0b76a3bc
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9832

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/free-robux-generator-2021-no-human-verification-or-survey-game-hack PDF link annotation
    • http://perpus.masda.ac.id//repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pubg-uc-carding-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-daily-free-coins-link_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
stream_004_off0000509c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509C 27432 bytes
SHA-256: 36961ffc5d25543d174291409e3447803993c6eb62ace34b113d61346a85b82f
font_01_sfnt_off00008ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED6 19556 bytes
SHA-256: 76adbda1d3e57e3064df3e292cf485a94c26c1a96e5d3a4e3c484cd1a4e129d0

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