Malicious PDF — malware analysis report

Static analysis result for SHA-256 665896225ec7feb3…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 03:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85cf29124b1a08b1f9c987e727a2f64f SHA-1: b497f4f3998dbbf226f783e1775f62fc48c19688 SHA-256: 665896225ec7feb39abb8e155aab139f5d000af2cf416bfef84643ac4e1d7a85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with the primary one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, while heavily obfuscated, contains the malicious URL, reinforcing the redirection attempt.

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.cc/wix?keyword=el+diario+de+eliseo+jj+benitez+pdfws
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/c3f88d_83b6a81ad34f40f58cef3cbf6c9dd6e8.pdf
    • https://static.usrfiles.com/ugd/405339_9afb613a8dde423392da2223a00bbe3e.pdf
    • https://static.usrfiles.com/ugd/6cf392_bff7a5712349450b88f6cad7c1a89d00.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/jupajex.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/99622608604.pdf
    • https://cdn.shopify.com/s/files/1/0434/1877/9815/files/zitezuvoxal.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/faragufitodovip.pdf
    • https://cdn.shopify.com/s/files/1/0434/6976/6808/files/burukitosajuluvifewamupe.pdf
    • https://static.usrfiles.com/ugd/26481d_49cb6f0812244f47b36c70028e8df222.pdf
    • https://static.usrfiles.com/ugd/b8c837_50520f0c62844294b3b4868086be4c3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e18870aa8e9345a9b01bf4aeaf94329b.pdf
    • https://static.usrfiles.com/ugd/dcfb95_671a5b0011ef47da8048ee9f851fb9b5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b7.bin
0547683b59bf313afe559eeb839feb7d23ac69b1b724c76adc8183299aa0789e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 5136 bytes
font_01_sfnt_off0000764a.bin
c264000a51e6cd101f8c258cc857084f89ecd2058b54271dc4388e347b3e1a75
pdf-font-stream PDF embedded font (sfnt) at offset 0x764A 11296 bytes
font_02_sfnt_off00009b01.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B01 4324 bytes