Malicious PDF — malware analysis report

Static analysis result for SHA-256 9182dd8aa7627091…

MALICIOUS

PDF

40.3 KB Created: 2020-09-02 03:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f064aa7496da97de505927eea4c14c3a SHA-1: 52c69091b6cb32acf0730972a16a72cfba4d9ea8 SHA-256: 9182dd8aa76270917bb9d52859cfbdd6167ca2e4d86580922dbf18defb8123aa
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains text related to '5th grade math review worksheets' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness.

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=5th+grade+math+review+worksheets
    • https://static.usrfiles.com/ugd/74a852_76bccb9b848d46eda8eacd4ab246a70b.pdf
    • https://static.usrfiles.com/ugd/704566_8b6ac9789a574e1a969f37ea4d1a7fb5.pdf
    • https://static.usrfiles.com/ugd/48d9a1_c6aeefb50400451191194ff2a16bdc63.pdf
    • https://static.usrfiles.com/ugd/6846fe_eee40feaff9d47b1902af1c10b78b3a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f28a05ff4c6c4d01bcfd70be4c980071.pdf
    • https://cdn.shopify.com/s/files/1/0439/2386/5768/files/character_study_of_daniel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/juzotiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/21019750391.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1715/files/90011951469.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/xidaninuduvofevixidoxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/wapodegepida.pdf
    • https://cdn.shopify.com/s/files/1/0457/5526/9276/files/56990416119.pdf
    • https://cdn.shopify.com/s/files/1/0440/8147/9832/files/dinivuvajegupubufulubofar.pdf
    • https://static.usrfiles.com/ugd/b8c837_09700cbd270b469b85e10c2db4c465d1.pdf
    • https://static.usrfiles.com/ugd/0c268c_e6890347ec804095bc5b306c888f3058.pdf
    • https://static.usrfiles.com/ugd/35dc59_8fb896f9d7dc4865ae76a5a5dd899d95.pdf
    • https://static.usrfiles.com/ugd/ca32a8_e70d6351e86346fab329a6eb84f0e5cc.pdf
    • https://static.usrfiles.com/ugd/76dd3d_a691d1d9f5e547c880308d2590a39a0a.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_off00005ff7.bin
70a601d12695742378b98831e9a753d92292f1e502f2d82c1fe2f100d939b8a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF7 5452 bytes
font_01_sfnt_off0000726a.bin
d66635bf381ceb4f1a1083c96af2238367b0a3e11590649d8cd75aa8b7d5b71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726A 9980 bytes

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