Malicious PDF — malware analysis report

Static analysis result for SHA-256 190f1dafba622ac4…

MALICIOUS

PDF

45.7 KB Created: 2021-05-17 12:31:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 91579868b339f378fb021afd60943a38 SHA-1: 64dbcca8c1d50cc9c3969ff5248b39cb21b5a671 SHA-256: 190f1dafba622ac45123601cef1e5f02a6fb1d16b6b25c3788664737844e1f64
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF documents related to game hacks and free currency. The primary lure appears to be 'Free Robux No Verification 2021', directing users to a suspicious URL. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/431946152/free-robux-no-verification-2021-game-hack PDF link annotation
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/do-you-get-minecraft-windows-10-for-free_GM479516143.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_off000048e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48E9 24752 bytes
SHA-256: b9e7138bf96bec031b5465f463870b4a981fa1bd56c3c53c930fe3d9422cf694
font_01_sfnt_off00008131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8131 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD8 19004 bytes
SHA-256: d712ae43aec968503a6d4b8ef93db90b07e4d7d9799b66e9787cf09d99ae12e2