Malicious PDF — malware analysis report

Static analysis result for SHA-256 4090f22356ae0028…

MALICIOUS

PDF

76.6 KB Created: 2020-08-29 14:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6781b2d06dc6b73ccdcbe69a3f12569 SHA-1: 169cd28e6070144979bc02e47994ed994fdd7d11 SHA-256: 4090f22356ae0028e93a5ed5743e9cbb2c4cf734a68fdde3f5507144640e2996
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link to a redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'battle brothers beasts and exploration', and the embedded URL also reflects this theme. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or SEO poisoning attempt. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.cc/wix?keyword=battle+brothers+beasts+and+exploration
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/99591746771.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/17526396729.pdf
    • https://cdn.shopify.com/s/files/1/0431/5057/3724/files/masterbuilt_sportsman_elite_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/91692863171.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/cambridge_book_10_test_3_listening_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/42612278889.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/xiguwelod.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/17891638096.pdf
    • https://static.usrfiles.com/ugd/b8c837_d875d13cd1e6451d9ac5728e0dbfcc71.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b258fa5bdb14960bd08c7cdd2eca49a.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e615173dc842f485a4b6990aa8b426.pdf
    • https://static.usrfiles.com/ugd/19103d_e8086402ea534bba9221dc21bc2e8420.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cbf32c67fcd438ebdac23d0626f80df.pdf
    • https://static.usrfiles.com/ugd/b8c837_508c25ef685e46debc058e6f0103545b.pdf
    • https://static.usrfiles.com/ugd/b8c837_63fa5c06e79e4155b579388d06b9f5f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a9a94e16e1245bf9f198ea971a5db30.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0433/4718/171

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbe.bin
54ebbd1fc3fe02a1cbf04a0000904aca5bbc8579be7f99ecb15ab70071c770d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 5304 bytes
font_01_sfnt_off000101b7.bin
8dc4e212a3b22f2185b75172d1e9b20c18b8bed87c4a7932260f46a50dd1e238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 10204 bytes

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