Malicious PDF — malware analysis report

Static analysis result for SHA-256 385534ab5658352a…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 20:19:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: db1593580a94b4a1a94780255cad940b SHA-1: 0d10215ebb65732cc290b4d03717fd2eb7930112 SHA-256: 385534ab5658352a94835f85df7fe1832092642fa05bcb7ec36f6548146e1ecf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms and malicious redirectors. The document body explicitly mentions 'Coin Master 15 Free Spin Link' and 'game hack', indicating a lure for potentially unwanted or malicious content. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack, which leads to a collection of other scam-related PDFs.

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.tw/app/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack In PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-bloxwood-hack_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-hack-roblox-accounts-2021-with-wire-shark_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-hack-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-speed-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/robux-hack-pc_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-make-a-free-account-to-change-how-you-look_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/80-robux-a-day-free_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-hacks-to-hack-any-game_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-hacking-admin-house_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/hack-into-roblox_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_off000030c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C7 22840 bytes
SHA-256: 40d968f6aea00a7c8b6bb449f25aab2e5dd75a934b643c68717a86ffd6d869ff
font_01_sfnt_off000063f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F3 18932 bytes
SHA-256: ab5bf67824d9f1de49592764067eca3c5a6c622e8f4c11d8ed5e999977e69fe8

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