Malicious PDF — malware analysis report

Static analysis result for SHA-256 046341424f839c81…

MALICIOUS

PDF

48.0 KB Created: 2021-05-16 17:42:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 445f3df5e9bd06c24255e8e223b25a9d SHA-1: 3d3c72919e2173e8fd203d204b4c675db17785e0 SHA-256: 046341424f839c81fe91c0fcf2e829a292585e141b28de546ee4434ec2cc84eb
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 0.9013

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/479516143/free-minecraft-wallpaper-game-hack PDF link annotation
    • http://medinup.pt/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/roblox-hack-game_GM431946152.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
font_00_sfnt_off00004a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A59 33872 bytes
SHA-256: 587b0a751501abe8880db9e2ea7636557329588c6ba0de88fa4d9fbbf63a173d
font_01_sfnt_off00008f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F69 3092 bytes
SHA-256: 3811f2fb1880daf4953efcc9c7427d9b438bced237490b00be4a6ec3ecea79e0
font_02_sfnt_off00009a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A14 18016 bytes
SHA-256: 8ceb16c7d7437810277100198a3ec62a9f5fb112cf647c9207096ad65213b8bb

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