Malicious PDF — malware analysis report

Static analysis result for SHA-256 086e05b9830e3628…

MALICIOUS

PDF

42.0 KB Created: 2020-09-08 14:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 537fe6cc4039a46a39029cd2116a6ff2 SHA-1: 5d177b8d00b498cab4e8901c7e5de5f19c4eb634 SHA-256: 086e05b9830e36287c8cef5e3d6a10e2afa68d371fca137d92fc64679aea6f9d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.link/pify?keyword=qualified+business+income+deduction+worksheet+instructions', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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/pify?keyword=qualified+business+income+deduction+worksheet+instructions In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/18f527_ffd83fab78ca459eaf5f127e7bd53c05.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e66789_bfd593ec63094d98a6862a15948eeb74.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5dc3ca_aef97b989a6e4379a529b59f0742b803.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/622218_1b87cf8de7884a648041bf9d177b68ac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/mefane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3459/0875/files/diagnostico_de_neuralgia_del_trigemino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/75847198374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/31458836679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6264/7191/files/cdc_treatment_guidelines_for_hepatitis_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5847/6694/files/colliers_canada_research_reports.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/39844036537.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6412 5620 bytes
SHA-256: 295b66ca49d4bb0da14e761780e97e2975d09d7c968eec8c68522703b2d8f6b8
font_01_sfnt_off00007714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 10488 bytes
SHA-256: 235264f83b66498d48a2dd538d7924bbe5473130015cd8df3e9bcc6b563732ef

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