Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99a1a3ca35d4685…

MALICIOUS

PDF

53.2 KB Created: 2020-08-31 04:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c54ecfc29ecfd59dc81bea99fb14ef2e SHA-1: e3bd740c9c5c88c591d0da2ef5de92dedea11158 SHA-256: e99a1a3ca35d4685eada0e8d94140b8071efff313d6dd832253b4d28e8c0cbb0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious link identified is 'https://ttraff.ru/wix?keyword=witcher+books+worth+reading', which is likely used to direct users to further malicious content. The document body, though heavily obfuscated, contains this URL, suggesting a lure to entice clicks. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wix?keyword=witcher+books+worth+reading
    • https://static.usrfiles.com/ugd/3649d2_2e222c9315e244af80152fbc09d77bd7.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_f5f5f3aae7c443ccb5d64689d42a2e0e.pdf
    • https://static.usrfiles.com/ugd/3826db_5a9b4f2b59324106b0f8e093094aa915.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ec19773e49fd47849eb80a83d4ce06ee.pdf
    • https://static.usrfiles.com/ugd/0aab01_e19c0306ccb344708375f5d9f4c3125f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834814971b8414ca577aa28b115deb1.pdf
    • https://static.usrfiles.com/ugd/a31856_6f6351dd51a441fc8ad7285d88e73d86.pdf
    • https://static.usrfiles.com/ugd/f09a9d_1da3c7343aa74cfebbfcbb01b66790f7.pdf
    • https://static.usrfiles.com/ugd/76de1a_5acf62c942e54ba493254a73faba62f5.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_a12c7bd63f5d4b7ca22123cb579b48dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
    • https://static.usrfiles.com/ugd/b8c837_604205606b5744b7bbbff45f4fcc0137.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/351399324.pdf
    • https://cdn.shopify.com/s/files/1/0436/4664/8473/files/genetic_variation_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/xinap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/bsa_committee_meeting_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8791/files/comics_marvel_download.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078f1.bin
2cd2b3a070eadba92fa73bb5a4bfb76fecb662b109a9f9462922c4c72a5e3f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 5480 bytes
font_01_sfnt_off00008b99.bin
423efb512eb2e0f1328e04dfb78f024f8d23902937e24f417f14426b8f3a100d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 10068 bytes
font_02_sfnt_off0000ae4c.bin
4c6e61167d4c6c228aad8823441bd5dbb990b41bd1b4411b87d5d0fd606b11d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4C 17136 bytes

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