Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d62aba7c70bb7fa…

MALICIOUS

PDF

38.2 KB Created: 2020-08-24 18:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15c21059ae00a1104509eb9f7f579b64 SHA-1: 340b9d77128202a77f7c24f35a69b77e17cc45bc SHA-256: 6d62aba7c70bb7fa0a185fe8ab14b67aa39a7208b1a1d4f8dd8e9bb9acdbb78d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to host SEO-optimized PDF documents. One prominent link, 'https://ttraff.com/pify?keyword=degrees+of+comparison+of+adverbs+worksheets', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to disguise the malicious redirect. No scripts were extracted, but the heuristic firings strongly indicate malicious redirection and link farming behavior.

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=degrees+of+comparison+of+adverbs+worksheets In PDF document text
    • http://fipilul.thenaturalpharmacyblog.com/uploads/1/3/1/4/131483109/6826378.pdfIn PDF document text
    • http://files.pineappledreamvacations.com/uploads/1/3/1/4/131438641/c7d4fc.pdfIn PDF document text
    • http://kuvulaf.campustour.ca/uploads/1/3/1/6/131606027/removujuruforaxe.pdfIn PDF document text
    • http://vapigupi.saintgregorysileby.org/uploads/1/3/1/3/131380934/kotebogisarisaf-folijoma-rojugizaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/social_media_marketing_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7600/9632/files/19701653845.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/surikubevumibijivuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/pathfinder_advanced_class_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/html5_video_background_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/luwujifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9429/5203/files/the_perfect_crime_locations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/2_dimensional_array_in_c_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/sadosilere.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_off00004d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1A 5892 bytes
SHA-256: 8fe3add142c6367085cc48d87ccf8863d00713f2d2b655c409b822a20e4dff4e
font_01_sfnt_off00006112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 13572 bytes
SHA-256: 06bd2dba671746e6af98226952557faf09f3aa64e7e093dc8891eb5b209869ef

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