Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c5b2f27c4106bd…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 21:30:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 81f599afcd45e355fb9de15b56c6f294 SHA-1: 56bdb971452935f41289eb8fe3ca6ede7d8945fe SHA-256: 83c5b2f27c4106bdb07dea2a76f372dbd73c51fbcef2bd8d076146472f08c546
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 0.9971

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.xyz/app/431946152/no-scam-free-robux-game-hack PDF link annotation
    • http://reisebild.eu/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://reisebild.eu/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://reisebild.eu/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://reisebild.eu/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/free-robux-generator-for-kids_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
stream_003_off00004971.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4971 25412 bytes
SHA-256: c28a27697e864f874e6fe49714db096597ba216612b52c282712a4ad2748b426
font_01_sfnt_off000082fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82FC 18500 bytes
SHA-256: 028f53d29b1a624cb68bae5e747b7c177b5cbf8f783d4c53e2642c12f49f399d

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