Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdf95b7ecf0319a…

MALICIOUS

PDF

48.8 KB Created: 2021-06-14 01:23:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 08b313897a64cf292ab7ac7c6750f637 SHA-1: a9a941414fbb4f13768f3c54218362d6b63310ee SHA-256: fbdf95b7ecf0319a0fec2a9b088c618d3597203aff3eaf1aa45a890e1a966d48
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment 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 0.9228

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 http://netcdn.co/app/431946152/how-to-add-cute-clothes-on-roblox-for-free-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/roblox-free-games-guest_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-no-verification-or-email_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-candy-id-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-hack-into-roblox-and-get-builders-club_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-roblox-promo-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-use-cheat-engine-on-roblox-without-shutdown-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/vehcle-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-redeem-code_GM406889139.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_off00004ca3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA3 27208 bytes
SHA-256: 4195ae12d1388b30a1a1551db3ce279fab357a3f62062d81bb0afef2648d4896
font_01_sfnt_off00008baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAF 4716 bytes
SHA-256: de979c37eaeea8779e9f2adbe72fa697ac015893db03038d227f4c24ad75eaaf
font_02_sfnt_off00009abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABB 18880 bytes
SHA-256: b7931984c68658a53e9f41e8032e6085d16611cf8809489165d46af4b017366a

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