Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5351e797797d9f7…

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 05:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec542b216f0be1e73337357da6e36c8 SHA-1: 1dd14b4227a5f1e2364a602f0b604550556e3f75 SHA-256: a5351e797797d9f7d4f057d1cf47b5e6e5f4b9ca9a2e521cc40c64fffe9c3ed7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.club/wix?keyword=fact+and+opinion+worksheets+4th+grade'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. 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.club/wix?keyword=fact+and+opinion+worksheets+4th+grade
    • https://static.usrfiles.com/ugd/73cb9e_196730cea8fa4d668faabd033f367f9e.pdf
    • https://static.usrfiles.com/ugd/0779a3_0cf3e02b85cf42febe1b215d10b7cf48.pdf
    • https://static.usrfiles.com/ugd/d1d005_c675c570b32649aa88bf64bd81c3b38d.pdf
    • https://static.usrfiles.com/ugd/6c98bc_fc6fc20955da4c72a8c3caf0177e9186.pdf
    • https://cdn.shopify.com/s/files/1/0435/1062/8511/files/auld_lang_syne_piano_sheet_music_free.pdf
    • https://static.usrfiles.com/ugd/e3325f_d00989ec83fa438fbeeb5f92da94035f.pdf
    • https://static.usrfiles.com/ugd/1df9ea_0a26aeefb4b24478bdb47a9e0ad99b60.pdf
    • https://cdn.shopify.com/s/files/1/0434/7926/9541/files/53515312889.pdf
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/12687650241.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6773/files/44805526957.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4011/files/camera_raw_format_metadata.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005608.bin
573250412f8a7c052933896ae6be9e2b40bfbda0732f0b139935812ee1ab908c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5608 5500 bytes
font_01_sfnt_off000068dd.bin
f19a4523930805d226a52bab28a97f20b354cb6418831b4730d26a0f7da61819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 9996 bytes

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