Malicious PDF — malware analysis report

Static analysis result for SHA-256 18579e3e63f761cc…

MALICIOUS

PDF

44.9 KB Created: 2020-08-29 17:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ac6b2cd6a02d8b362a4346d9cdab98 SHA-1: ba4fc87c1e7e14aa329b9f18cbb9308a0153bed0 SHA-256: 18579e3e63f761ccd0c88f41a86e1e1e6623dc152320fd4b2d96e39f6e970f85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as McDonald's operations and training information. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to drive users to this malicious site.

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=mcdonald%2527s+operations+and+training
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/01e791_f846f0a5e7b54f3d84616640fa84242e.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d19a79efe345d0bc8ffa3f4fb0913e.pdf
    • https://static.usrfiles.com/ugd/5ecadc_7de760a0fc2a480aa5a5e581609a5451.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe0a17260b16451dab778b2de929a7bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed59e422ec054ee081e18de4f03e6c5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f8343cff1d749209f13e85b872057f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f4d09b9fea84cd1b14c3408aa13144d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2b05f74c414cb7b4fb22603b6603d8.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/form_2210_irs.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/76821358995.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/31772853173.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/54103002403.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/zerejakadegeporum.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_off00007065.bin
846df5a890eb691ea9686db37162ad27bbe827adba4e2eca7218b3489d6f4adc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7065 5280 bytes
font_01_sfnt_off0000826d.bin
3e7911787f55203e23bbbea3921440d6cd390ff31bdd9d4eba30a14d72611265
pdf-font-stream PDF embedded font (sfnt) at offset 0x826D 10780 bytes