Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bb832529ab9e1c…

MALICIOUS

PDF

42.0 KB Created: 2020-09-05 00:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153be35fc7295de21be64c7a5cefe04b SHA-1: fe41cf3e3683aafd524aa51bc7f10452dd723247 SHA-256: d5bb832529ab9e1cc4f49f1a54ec31ef813cbeb64ca4d617e4b68118d2f6af8b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The document body, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting a phishing or social engineering attempt to redirect the user to a harmful 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.link/wix?keyword=critical+appraisal+worksheet+systematic+review%252F+meta-+analysis
    • https://static.usrfiles.com/ugd/b8c837_527e1dd520674f53a0cf9c4579a140c3.pdf
    • https://static.usrfiles.com/ugd/80bfa9_6a8a39e9c4eb4a64b7b6111b856f1542.pdf
    • https://static.usrfiles.com/ugd/b7ab08_8cdfee745324411585369e1b445db476.pdf
    • https://static.usrfiles.com/ugd/b8c837_477f3ffc5768402d8ab933cb0032aa9c.pdf
    • https://static.usrfiles.com/ugd/432b07_80c695ceb1054f2f961bcb42dd6734e9.pdf
    • https://cdn.shopify.com/s/files/1/0436/1447/0302/files/wodap.pdf
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/fairy_tail_ova_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/the_knight_s_tale_movie_worksheet_answers.pdf
    • https://static.usrfiles.com/ugd/2f3216_60a7951156ad47e1918ff0258713cc24.pdf
    • https://static.usrfiles.com/ugd/225520_a4859198bb6747c498dd46211ccf2626.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c03e11b03fc4f46b2e3868bc0f208f9.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_off00006463.bin
71554b952a3b4f49a61c1bb7cd22d0ed73bc319d9b8ea1a5f2035ec76d8127cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6463 5464 bytes
font_01_sfnt_off000076f4.bin
bd06f2e2e4778487c52cf2d5e54ecc37e8ada551a7dc6ad4f4b9c93172db7513		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 10472 bytes

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