Malicious PDF — malware analysis report

Static analysis result for SHA-256 005e6f2e84e8c167…

MALICIOUS

PDF

58.8 KB Created: 2020-09-06 01:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0172a711ed824bc832ca2fa7d8c2a756 SHA-1: a8740547c0f4926fb25c78fc9bae6c068f944863 SHA-256: 005e6f2e84e8c167ed451e71df55f682581dc710069ff39b9f526035f35a342c
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=agronomy+objective+question+answer+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting an attempt to disguise malicious content as relevant information.

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=agronomy+objective+question+answer+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/5803/6646/files/sotuzusudoruzuzuxegigafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/sudizotabefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2455/files/bangalore_city_route_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/49302376064.pdf
    • https://cdn.shopify.com/s/files/1/0429/9158/3391/files/osrs_most_traded_items.pdf
    • https://static.usrfiles.com/ugd/0286dd_c445a3edde9d4ef6b84becade484f5d4.pdf
    • https://static.usrfiles.com/ugd/03a576_dd03571b20b145c685c66aab741c8864.pdf
    • https://static.usrfiles.com/ugd/c5d40f_ed5c129eb6d14c78873ad98bd2912564.pdf
    • https://static.usrfiles.com/ugd/bdc04d_b84054909b1340bba80b206d0e9bd969.pdf
    • https://static.usrfiles.com/ugd/808d8c_a722a1330f724f0289d3dfc3893993ed.pdf
    • https://static.usrfiles.com/ugd/a48928_a3014df70a0f4f7997269470408c7f18.pdf
    • https://static.usrfiles.com/ugd/429b25_edf3fc9e097645658293e9ba6bf1913b.pdf
    • https://static.usrfiles.com/ugd/5e8de6_02da2b1e93714fe38b0ef55b444d400b.pdf
    • https://static.usrfiles.com/ugd/8a05ec_23504b97235243ba99a9c3b563ad94a7.pdf
    • https://static.usrfiles.com/ugd/625844_6775934bc6964c198ec853848726c442.pdf
    • https://static.usrfiles.com/ugd/6a7407_6ac8e7fbfae1487f91224471b0e60ccc.pdf
    • https://static.usrfiles.com/ugd/e3325f_5949fd878f60499985b85ef3f682756e.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_off0000a5ec.bin
76c78615055783de92bde1fbf81fbe82f8c462ee57fe8c97151503eb0764a6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5EC 6028 bytes
font_01_sfnt_off0000ba76.bin
b9b93d54572e9c644e94ba663abd0b390e16c9339da95f94b5a58cd7e86ffe34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA76 10304 bytes

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