Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a82d6278e2c8cc…

MALICIOUS

PDF

33.0 KB Created: 2021-07-05 19:13:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8fd4ae6385dfc298afbee5e71997c547 SHA-1: ac67ff92e62fb3f368c49130062592d62a5748c6 SHA-256: 13a82d6278e2c8ccfd848a9ccd1dbe6410d23b338b82b644a026a6c7c84fe0ad
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized and promise free in-game currency or hacks for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic suggests a deceptive user interface. The primary attack pattern involves luring users to these external sites, which likely host further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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 http://netcdn.tw/app/431946152/robux-hack-2021-game-hack PDF link annotation
    • http://lib-smansumsel.sch.id/repository/how-to-hack-a-roblox-server-and-save-it_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-intsall-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robux-boost-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-a-roblox-hack-in-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-pocket-edition-free-download_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_off00002d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D65 21200 bytes
SHA-256: 671a60e0941830f2a254756a7724c4067acf0e8020d192f4df9196a3706cd84f
font_01_sfnt_off00005b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B94 19124 bytes
SHA-256: a01abce438ace15ff0d22223d5cc83267d648dadbc6e7de58085c68645cb2558

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