Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7965b4df4f3c9e…

MALICIOUS

PDF

46.5 KB Created: 2021-05-13 05:44:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4ee9a1f7ab9f82690a8fbda9bc677b8d SHA-1: 0bb6897c6901944f85a3de6cfb22082fdebee68d SHA-256: ef7965b4df4f3c9e962975cca67d2e9fe84759ef006e3d498f334eec62867499
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, identified as a "PDF_SEO_LINK_FARM", directing users to sites offering "free Robux" or "Coin Master" cheats. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the lures suggest a phishing or scam campaign aimed at tricking users into downloading further malware or providing personal information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/431946152/blox.pink-free-robux-game-hack
    • http://perpustakaan.man2kotaserang.sch.id/repository/minecraft-jar-free_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-online-hack-generator_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/ultimate-free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-links-for-today_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/how-to-get-robux-on-phone_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/bloxland-earn-free-robux_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/games-that-give-you-free-robux_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-hack-apk-35-13_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-hack-apk-link_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/how-to-log-out-of-coin-master_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/free-stuff-on-roblox_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-free-coins-and-spins-group_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/cute-free-roblox-outfits_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c83.bin
75592c82be4621da8b40e221bea6e6c9ec3026ebb6bd30d2ff16f1cc329c1e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C83 25820 bytes
font_01_sfnt_off000088be.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 2824 bytes
font_02_sfnt_off0000926d.bin
20ad8a2126bb9f489cd4862944fdd8c1c01869fd803457c3ce1390bedb89f69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x926D 18620 bytes

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