Malicious PDF — malware analysis report

Static analysis result for SHA-256 af99587be9bda005…

MALICIOUS

PDF

33.6 KB Created: 2021-06-26 23:11:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 421fdd5b1bab23778c527db077fc3814 SHA-1: 782d1ce91c4634c04d6c08850ae6ca4276d75c21 SHA-256: af99587be9bda0057832991ef33f6af2646946d8ac4b527c19481a3d04106dbe
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/roblox-free-obc-lifetime-code-game-hack PDF link annotation
    • https://seedungo.com/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/roblox-speed-hacks-that-u-can-type-in-chat_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/free-robux-ohne-handynummer-deutsch_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/how-to-get-free-robux-without-waiting-2021_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/will-roblox-be-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • https://seedungo.com/images/free-robux-android-no-survey_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://seedungo.com/images/roblox-hack-naval-warfe_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/script-hack-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/wanna-join-my-free-giftcard-giveaway-roblox-id-audio_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://seedungo.com/images/how-to-get-25-free-robux_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/cheat-fly-roblox_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/free-summer-grl-free-roblox-skins_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://seedungo.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://seedungo.com/images/coin-master-free-spin-2912-2021_GM406889139.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_off00002c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4C 22152 bytes
SHA-256: a7d66f1edc80f9eeceae63ee5bfbb1cc8edf32fcd8c0e964f294068d08c8783b
font_01_sfnt_off00005d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D70 19308 bytes
SHA-256: 81449b7e972c1656fa66a8b395918db5d2aecfc0504722e53142ab4086d77cbb

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