Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cc5d0f0d9ab4f7…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 12:07:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 90656f080709b2959453650759a9c249 SHA-1: 109956da979aad0d50fe1bf588d5871eabe3421c SHA-256: 47cc5d0f0d9ab4f701fb2695eafa4b21cfbef837a4e35f99b73249ec1ec935ff
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/406889139/free-coin-master-spins-daily-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/free-wallpapers-for-roblox-fps-games_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-outfits-for-avatar_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-2021-robux-in-game-cheat_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/download-cheat-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/yin-vs-yang-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-legeal-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/5-roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-go-300-free-diamonds-on-roblox-royale-high_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-roblox-net-one-hendynummer_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-free-roblox-glitch_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_off000031af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AF 23076 bytes
SHA-256: 5792c2ac8677adc43fa828ec801d66d3504e4faa840328cdcd4028393daa07f8
font_01_sfnt_off0000659f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659F 18596 bytes
SHA-256: a7833972b885d34acb5ad01908fbd6133f193c29e2abbc4434009272e0e2ed6c

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