Malicious PDF — malware analysis report

Static analysis result for SHA-256 17480c401bf6811f…

MALICIOUS

PDF

44.6 KB Created: 2021-05-11 07:04:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 287c68f279f2b895d2a033ab26bd4df3 SHA-1: 98f0efcddcf9ab0d0ff3e0671bb6af7b831bd061 SHA-256: 17480c401bf6811f5ddce7e19303605b4e97241594f329bc759201b47b8aaa9c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9632

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.xyz/app/406889139/free-spin-link-coin-master-today-game-hack PDF link annotation
    • http://202.56.165.220/digilab/repository/free-coin-master-spins-link_GM406889139.pdfPDF link annotation
    • http://202.56.165.220/digilab/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-no-verification-2021-android_GM431946152.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_off0000485b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485B 24776 bytes
SHA-256: 8c17ff2d67d2f84f12820d2d13cf7b4ca5749633600d416955c340d04d838957
font_01_sfnt_off0000815b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x815B 2880 bytes
SHA-256: 29ffac6ae2c225ad742d302df2deaca7764d0abb58a6f2c81d3137a4f416ba07
font_02_sfnt_off00008b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4A 18412 bytes
SHA-256: e587088874bde045b6c3de0610cebf0d89afe726cd39a539bf85554ca93a9bfa

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