Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fec1d93443e469…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 19:31:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6bb5b0fa748460efa9ff5258860bf45a SHA-1: d84c75de56174271ebdc2a827a2c4cb88616706a SHA-256: 73fec1d93443e469abef15ca4066dbcfdfcdeaa61251f4fd6d6cca1691cc3a54
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 0.9969

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/how-to-get-free-robux-by-playing-games-game-hack PDF link annotation
    • https://www.citrus-shop.cz/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/oprewards-com-login_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.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_off00004939.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4939 26316 bytes
SHA-256: 0b052a57e75605b6b7db07df2a7ca3c508c3c405bddc6d6f8b5b75b4dc68960a
font_01_sfnt_off00008409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8409 19588 bytes
SHA-256: 4959be52701d88ef79c98b835575558ad206ad5c377459138293e90af74f97c3

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