Malicious PDF — malware analysis report

Static analysis result for SHA-256 6850df8e4d407e6e…

MALICIOUS

PDF

45.0 KB Created: 2021-06-10 13:57:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b393c9427cc3a1410994f5718adc8231 SHA-1: 272aa5fd334283550b296df9263ad00d88a93c22 SHA-256: 6850df8e4d407e6e6da3b6fa5d0733ac21ea5e921a5415ef4e4bea79bf2b98c2
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 0.9865

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 https://netcdn.tw/app/431946152/roblox-free-roux-game-hack PDF link annotation
    • https://lib.btkljogja.or.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/cmo-hackear-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-clothes-on-roblox-ios_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-and-tix-online_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-hack-rbx-juin-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hacks-that-work_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_off000053d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D4 25676 bytes
SHA-256: 6f1cbea74fbbfa3334c776b467b1046388951aee711ad24682b466d2117c6baa
font_01_sfnt_off00008ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DED 18088 bytes
SHA-256: 03c92d59c548fbfdae08874221752d30f8caaed88781636bf7d18542e7c5fe52

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