Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dab6686038674a…

MALICIOUS

PDF

46.7 KB Created: 2021-05-15 09:19:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a6acafb8be00927a4cbb165e76753e14 SHA-1: 2412a8d6909aa4f5193fbbfe992c98b825734d29 SHA-256: 54dab6686038674aa2c06e420161094c4a1da2c49edd2cefeff088fcee7e8cf2
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 0.8948

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/robux-redeem-game-hack PDF link annotation
    • https://consorziocsa-asicaivano.it/images/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/game-hunters-coin-master_GM406889139.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_off000049f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F9 26876 bytes
SHA-256: a7c95bea36f354df5f9de59122330c0e04f7fc75471f84e74ee5d03cf947b152
font_01_sfnt_off00008775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8775 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000941c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x941C 18284 bytes
SHA-256: 44dc1e2cf684a6e0cb1a9975d010cf8d82021a8fc0e8862ab9775ffa9cb00637

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