Malicious PDF — malware analysis report

Static analysis result for SHA-256 334bdca9c0c08374…

MALICIOUS

PDF

53.1 KB Created: 2020-09-02 05:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2431622068d40cba56a6852543966cee SHA-1: f06824397b2ef7f8ac116f258a4f383dd7c941cb SHA-256: 334bdca9c0c0837405d25fd04f127d09ed5ece91486d1922db90bdf4e58597b7
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing links to known malicious redirector infrastructure, specifically 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding a large number of external PDF links, many hosted on 'cdn.shopify.com' and 'static.usrfiles.com'. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for these links. The primary attack pattern appears to be SEO manipulation or a lure to redirect 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.com/wix?keyword=arabic+language+phone
    • https://cdn.shopify.com/s/files/1/0461/3662/3257/files/employment_application_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0437/8820/6238/files/96991436628.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/piwajoxugebe.pdf
    • https://static.usrfiles.com/ugd/11f207_ee78d5c74e404a759ff8f9e7612ae198.pdf
    • https://static.usrfiles.com/ugd/13ae68_d0e5f7bd0e244ba599aed60d5c02219a.pdf
    • https://static.usrfiles.com/ugd/2ddd39_2f4e9e8f5136431c95527cc3bd2c36e5.pdf
    • https://static.usrfiles.com/ugd/e8506d_41d413706d294eb48d40d74a4dfdebbd.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_78f327e818414c72992546f5f92c479c.pdf
    • https://static.usrfiles.com/ugd/6c032c_db4f1941742f4bc4853ef70e347fc34b.pdf
    • https://static.usrfiles.com/ugd/451461_438107ff9f3c46b29697931540084208.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf257bcf4967410988f926d4b61bbb70.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f19b026a2444fb8a703bc85c9544f80.pdf
    • https://static.usrfiles.com/ugd/b8c837_7de91ee6400e4ae6a6f20299d784fb41.pdf
    • https://static.usrfiles.com/ugd/289c5e_c8d2a842dc924d6f958d53aaea745eef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000998d.bin
5426decacc89b2a438e429499d42ef9506858a7bdda37e2b4675f3e61aac5627		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x998D 25768 bytes
font_00_sfnt_off00006494.bin
80e8daf76f7f92c2069c040ab3baf94beba8bb3900dcd98db4b4a0147d497cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6494 5148 bytes
font_01_sfnt_off0000760c.bin
8a028daae92f76bbc918b9a83ec37ffa2e2a99386d7ea15cb7ae9ccadb53ace5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760C 10372 bytes

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