Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c5532545342b34…

MALICIOUS

PDF

46.0 KB Created: 2020-08-29 23:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f4305c2261be3205c0cfaf13402d3c SHA-1: f435962f39b4c699f1ea236237bff1ec631caba2 SHA-256: 03c5532545342b34da5d88ce2a36efebbcbfe049830350b68f3efb4fd3aebcbc
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, specifically 'https://ttraff.com/wix?keyword=factorisation+seconde+exercice+corrig%25C3%25A9'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting it. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to obscure the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.com/wix?keyword=factorisation+seconde+exercice+corrig%25C3%25A9
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/89c6ad_8b567c9728c84205bdaa855a31a384cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb7f2479483b46509ae1b8bf42284415.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d6882410fd848d0a33e1b415cfd021a.pdf
    • https://static.usrfiles.com/ugd/97aff7_08b4713eb0c94a77b5472232dc0dda90.pdf
    • https://static.usrfiles.com/ugd/b8c837_653b4965d3fb433f8d4c65a45cf23aa2.pdf
    • https://cdn.shopify.com/s/files/1/0433/6988/9943/files/gre_analytical_writing_books.pdf
    • https://static.usrfiles.com/ugd/10b11f_d7d673b3603f4449a4158baaf9a26d69.pdf
    • https://static.usrfiles.com/ugd/b8c837_5444f467fc5a44e5adaaa0d161119b7f.pdf
    • https://cdn.shopify.com/s/files/1/0438/0740/8290/files/68086908874.pdf
    • https://cdn.shopify.com/s/files/1/0434/8788/7526/files/60805106321.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/abundance_peter_diamandis_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8883/files/lupus_anticoagulant_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/6411/2805/files/wifelobanixarekegudubit.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050d1.bin
017a9964ca83a0218853aedc558d01016948a1ff10fea47ec6ff6a91e8261ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D1 5028 bytes
font_01_sfnt_off000061ad.bin
cad8fdeebf071795e98f737ebb422f665cf129889f0b2c3d9741ab55e9ee4a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AD 11128 bytes
font_02_sfnt_off000085f4.bin
f12bcc42cb143e9cc41a08ef9f9c81c8a36c017982c073a20263204097028d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85F4 16100 bytes
font_03_sfnt_off00009ab6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB6 4324 bytes

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