Malicious PDF — malware analysis report

Static analysis result for SHA-256 8303ac70ed108ee6…

MALICIOUS

PDF

48.6 KB Created: 2020-08-23 08:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 902e0e2067374201e902d5d4118424c1 SHA-1: 2d4f9e69fac9daedba8ffa7f0a94643e6d84c1da SHA-256: 8303ac70ed108ee628e647c85341dace0b11d511bf6c787ad1f719e749971d9e
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the text 'Antisynthetase syndrome case report' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious 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.cc/pify?keyword=antisynthetase+syndrome+case+report
    • http://kofabomim.hwy27yardsale.com/uploads/1/3/0/8/130873851/wobonoji_lutidisu_nijutoramovisik.pdf
    • http://files.scsreadingschool.org/uploads/1/3/1/0/131069839/mikejinin_zoteze_lotedisaxizus_fareraworu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/571323326.pdf
    • https://cdn.shopify.com/s/files/1/0440/1656/6422/files/72659983117.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/92448689813.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6629/files/hex_code_to_rgb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/90583661338.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/36950396836.pdf
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/bezigolawawawagilujona.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/microsoft_excel_expense_reimbursement_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/siribukilopexume.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/mejovogorofaxiwidigunes.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7593/files/rarawotimorudokodoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/76719493037.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/11631767267.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e02.bin
973274d57e4edb504f039e91bdcceedcb02459f42922992898091c91149c2781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E02 5160 bytes
font_01_sfnt_off00007f59.bin
303d092b32c093adf092904474710a942c73c80009356248bda600b8601a0636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F59 12496 bytes
font_02_sfnt_off0000a767.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA767 4324 bytes

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