Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8739733d5b27ff…

MALICIOUS

PDF

41.7 KB Created: 2020-09-09 09:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7b0981d14b19fdb2ab6c7ee219b63c35 SHA-1: aac6d3dcff0fba5dfa6062c8e760567eddd44678 SHA-256: ce8739733d5b27ff85f8ce3153af0dcb28f91648273cdac320a49c8517300616
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a compromised site. The presence of numerous other PDF links points to a link farm strategy.

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.ru/wix?keyword=gravity+falls+theme+sheet+music+trumpet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/f5892c_2232402e99504186b2f61964313a0e89.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5be868_872112d146d9441da7eb0ec5decc3e63.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70094d_83cf1981dea741d8b43e8347503a2b5a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0286dd_4deec5869aa342e7869331062176bc27.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9609/5397/files/22791385644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4010/3845/files/rawubopinigavagas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/6434/7035/files/lonely_planet_ho_chi_minh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/advanced_aircraft_analysis_3._5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/dalit_autobiographies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/3272/6952/files/zuzadef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6077/2516/files/1037715277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4909/0978/files/avery_template_5392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/remove_duplicates_from_array_javascript.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/impedance-_matching_transformer_imt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE1 5116 bytes
SHA-256: f123ccb8a8f9691944b02232ee196f68643e3b3ec9dd2e71bf70c1c341d711dc
font_01_sfnt_off00005e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 13640 bytes
SHA-256: 1d982c2dc9dc1bca68639e9a567ba4fa71259ee1aaefde1a8c7f72854d655f3d
font_02_sfnt_off0000893f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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