Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea92751e6da154ff…

MALICIOUS

PDF

45.7 KB Created: 2020-08-30 13:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb88e96b8e5ccb237f08d751c67afc0 SHA-1: 204f4f88601750896ee9078192e9de296fa261cc SHA-256: ea92751e6da154ff445848c829e2cf6c18974e3840275e9cec49b4b6d56e9a86
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL, 'https://ttraff.ru/wix?keyword=solar+eclipse+new+mexico', is a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious sites.

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.ru/wix?keyword=solar+eclipse+new+mexico
    • http://www.nmnaturalhistory.org/node/686-d
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/53963394178.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9018/files/contemporary_world_history_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/cashflow_game_rules.pdf
    • https://static.usrfiles.com/ugd/b8c837_f85a0c8408f24b5a8176195d23d1c47f.pdf
    • https://static.usrfiles.com/ugd/d99ef3_a2c3c50c969644f19f07099ec5aa0dee.pdf
    • https://static.usrfiles.com/ugd/b11f6d_f55c321ed0454c329a658f524a711f57.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cc8e483236b4629a2d83a1a97a25f86.pdf
    • https://static.usrfiles.com/ugd/136d07_996f4282d2d44883a5e8a03e0a44fd24.pdf
    • https://static.usrfiles.com/ugd/b8c837_362636c542d14cf99d234a49f50086fc.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/99869579056.pdf
    • https://cdn.shopify.com/s/files/1/0431/4362/6912/files/manual_de_alimentao_saudvel.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_off00006e18.bin
69e878f9265a7f3add1295e65c71df22601b879f2ff7ca0915a6e67f71448d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E18 5340 bytes
font_01_sfnt_off0000803a.bin
3ab32ef81017ac2b319b14a3129478bb9ab578e6d57d18174fcd14c55fde4608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803A 13344 bytes

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