Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccd0d4d3ba55220…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 03:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3351d2b9fcbabde992e85ec2118ba32e SHA-1: c06771f9a0a58b937668507449a272837f11430f SHA-256: 9ccd0d4d3ba552205decbb876560dd1605ccd70263f087f089468a2826b05689
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, also contains this URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL indicates a phishing or redirection attempt.

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=tener+and+querer+worksheet
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/56068553520.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/auxiliary_verbs_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/documents_presentation_memorandum_of_association_articles_of_association_project.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/36970654806.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/nipuwuzipikibigonodexez.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/pekanitexupisowodaxijozel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/98604069132.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/jetenifowatolojufesaxab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2371/1903/files/hedonismo_psicolgico.pdf
    • https://cdn.shopify.com/s/files/1/0432/1689/6159/files/55397113502.pdf
    • https://static.usrfiles.com/ugd/b8c837_c29ae1bceaaa479c8e4ea670a18e14fb.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_5cc7cdfbea6044248ae0db00bcf72c8b.pdf
    • https://static.usrfiles.com/ugd/5be868_68effd81b6604fe2867b5f3f20e8903e.pdf
    • https://static.usrfiles.com/ugd/2ca09c_6c081296cebd4785a64417cb7b7a8085.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_off00004d28.bin
856f96d4387625a5f80c54e19b68ddfe7ebe3016112ee1e8561516a66144b5d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D28 5112 bytes
font_01_sfnt_off00005e97.bin
7adcf0532e40f018ceab17c89f6976079568e1c02ceb4174198bcb4b272e20e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E97 9884 bytes