Malicious PDF — malware analysis report

Static analysis result for SHA-256 211d474369c16e08…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 21:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a4c7ef6cacc04d2b5fc191ad2f354102 SHA-1: 15484a084445aab006a1e290e22c8cf501b4a5eb SHA-256: 211d474369c16e08c667d936798bea508717b78285df505b37c981ff4d089598
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are associated with malicious redirectors or link farms. The document body and extracted URLs suggest a lure for game-related cheats and currency, a common tactic for distributing malware or phishing for credentials. The presence of multiple redirector links indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/robux-earning-sites-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/pubg-uc-or-pc_GM1330123889.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-real-working_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_off00005113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5113 27376 bytes
SHA-256: 0c358cb6076fcd8bd027bd5a6c7162ccc24db222041da95f9a61d08d33c6d97c
font_01_sfnt_off00008e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E62 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off0000985e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985E 18592 bytes
SHA-256: 86c9cbabc58c05dcca32ff3967a8cba2f2ca88b13f48cfcd06e4bbeea785338f

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