Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c71da678d7e0b23…

MALICIOUS

PDF

33.6 KB Created: 2021-06-18 06:09:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 28927026a1527cdf569aaf8cd4b0d754 SHA-1: 5db9fbb2093df1f022bb6bd92be67e9faebc7369 SHA-256: 4c71da678d7e0b23050bbffacdec91e34cbb932b736ec9a696f080d33b6d5541
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, including a critical redirector link to 'http://netcdn.co/app/431946152/free-chains-on-roblox-game-hack', which is designed to lure users with promises of game hacks. The document also features a large number of links to PDF files hosted on 'www.manmed.info', suggesting a link farm for SEO manipulation or further distribution. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/free-chains-on-roblox-game-hack In PDF document text
    • https://www.manmed.info:443/images/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/fondo-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-your-roblox-account-back-from-being-hacked_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/pokemon-go-free-download-for-pc_GM1094591345.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/on-roblox-someone-hacked-me-and-lost-all-my-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/roblox-login-hack-for-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/hack-de-robux-100-real-imfinitos_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/find-roblox-on-computer-hack-in-escape-from-the-demon_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-sell-clothes-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/is-tiktok-free-on-apple-store_GM835599320.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-minecraft-for-free-on-phone_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
font_00_sfnt_off00003027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3027 21536 bytes
SHA-256: 9e2395df8fc732189fc3ae29cd2e6224fccba73e157b965392bd7001a1d2f950
font_01_sfnt_off00005f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 18748 bytes
SHA-256: b06481fd344e896a1b49cd1cacfeded404822eb8d622242cfd014e4922636681

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