Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba90cd65da14f0f…

MALICIOUS

PDF

43.5 KB Created: 2020-08-01 03:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f5744bb68173002999afddaf218206 SHA-1: 2294a5cf717637afcfa722fac7269c4442ccfe4b SHA-256: 7ba90cd65da14f0f07dafe39e499c0edda4ab0a572f274ec6a9d37c921efd189
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text referencing 'Rosetta stone spanish tpb' and the malicious URL, suggesting a lure for users seeking that content. The PDF also exhibits a link farm heuristic, indicating it's part of a larger SEO manipulation effort to distribute malicious links. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=rosetta+stone+spanish+tpb
    • http://files.functionalhealthcoach.com.au/uploads/1/3/2/6/132681836/2a4ad.pdf
    • http://files.redeemerwestfield.com/uploads/1/3/0/8/130813846/nivisonifefow.pdf
    • http://files.thesehandsremedialtherapy.com/uploads/1/3/2/8/132814439/76cefd.pdf
    • http://files.wilmingtonprintandmail.com/uploads/1/3/1/6/131637057/cd8bc305482.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/37189036700.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/kesavomidusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/25815627736.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/zegisozemevodijir.pdf
    • https://cdn.shopify.com/s/files/1/0437/6929/9098/files/76577091040.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/diner_dash_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/4308366456.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/35261942975.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/61536003933.pdf
    • https://cdn.shopify.com/s/files/1/0437/9623/4400/files/32015497169.pdf
    • https://cdn.shopify.com/s/files/1/0437/0795/7400/files/wazetivurutovowixuzipijaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/12025496520.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_off00006ca7.bin
af48d482e7b088a2269ff0dd1ac3e0f9439a346b0ec250a67a01cff110ebbb28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA7 4924 bytes
font_01_sfnt_off00007d63.bin
46d66865e4317ad7ab3b51873e052d48fdb406497fad0b3b500d08a31b558ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D63 10656 bytes