Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97049cf552d82fd…

MALICIOUS

PDF

35.8 KB Created: 2021-06-25 23:55:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc2b2a19e52df732cfd0f783957478b1 SHA-1: a8aecd0fb326a89aa7769ef061017da88683c1c0 SHA-256: a97049cf552d82fd9df34254c39f9139dfd9bd089b5b999454be3fb09efa622c
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.co/app/431946152/free-robux-and-tix-no-download-no-survey-game-hack PDF link annotation
    • http://perpustakaan.ipts.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/comment-avoir-des-robux-gratuit-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/get-free-money-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/http-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-someones-roblox-accouny_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/anime-cross-2-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-hack-auxify_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/descargar-hacks-de-roblox-nuevos_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/monkey-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/cch-ly-robux-free-tren-dien-thoai_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/fbchampion_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-a-roblox-account-on-pc_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/ma-map-roblox-studio-hacker-par_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_off000031ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EA 22652 bytes
SHA-256: 0b3be7f660e59af48404757103cb6865c6019ebdd04e0918b7e4f6f1e025e29a
font_01_sfnt_off000064e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E6 19708 bytes
SHA-256: ff6b1b27c317ed2167c0f821eb8b3dc218f939c5c32590addb69d44f27dc62f0

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