Malicious PDF — malware analysis report

Static analysis result for SHA-256 1554b43dbcdbef69…

MALICIOUS

PDF

32.4 KB Created: 2020-08-30 23:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045258884b2a91eeacaff8f0052e12f5 SHA-1: 680a864fffa4921ead590a6403a3ce74e80e1282 SHA-256: 1554b43dbcdbef69a2980df55e0a018bfc523c838ce4ee2ded989b5897ecb9ae
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=arrowroot+biscuits+asda'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL indicates a likely attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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.me/wix?keyword=arrowroot+biscuits+asda
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2c8d66_909bba51eece41a8a9c0cd9e6c1cd24a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecca063486524e0cb3f99abcde058261.pdf
    • https://static.usrfiles.com/ugd/74c34a_ebc87c96984242148d1cad8b39206253.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/lagu_bergetar_hati_ku_bergetar.pdf
    • https://static.usrfiles.com/ugd/97aff7_295f058268b2435397ad8adf2e21d7e6.pdf
    • https://static.usrfiles.com/ugd/a107db_2c5d4dbbf0ec4d88863a42608387e8ff.pdf
    • https://cdn.shopify.com/s/files/1/0435/8871/4653/files/jazz_band_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/31523283398.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041b2.bin
1fc446bf533908a69889d79482c9020ac5ce661d4ac2fa5fc0c3838978ba4e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41B2 5120 bytes
font_01_sfnt_off00005336.bin
93c9628540a891c6edccb3b56101a373f5fab84a2c30b2c97ab27eeb8d1a507a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5336 10016 bytes

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