Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1616f3b77aae803…

MALICIOUS

PDF

32.8 KB Created: 2021-06-18 14:38:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8b7752d8c064628fdd4b5b43abe0025b SHA-1: ba3e4e99490573d94d4a1f7bbac669d8b2fe4b15 SHA-256: e1616f3b77aae80336d3c6e263ad14b33a4d6e8084ed2519bad66003d00a01f9
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 0.9980

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 http://netcdn.co/app/431946152/get-free-robux-real-game-hack PDF link annotation
    • http://prazdnik-kzn.ru/images/roblox-valkyrie-free_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/roblox-island-royale-hack-aimbot_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/how-to-git-free-privert-servers-in-roblox_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/roblox-new-version-free-download_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/heurne-free-robux_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/paste-bin-dab-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/how-to-get-free-clothes-on-roblox-without-bc-2021_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-robux-generator-no-human-verification_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
font_00_sfnt_off00002bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BCD 21804 bytes
SHA-256: f74446d9198d4fcefec365ada53a9d5e6b2c9742adc54948a5091c09f98b63ba
font_01_sfnt_off00005c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0F 18708 bytes
SHA-256: 1198b14eb353f0712f232b98af8a512b1b4c1a9ce74ccdd6bd1840e37f011eb6

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