Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e3367e8c10dd89…

MALICIOUS

PDF

47.3 KB Created: 2020-07-12 21:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a52396720ca1ba1402a8c2edb2f417 SHA-1: 16a45d46b67fb3cdacb5d1b36d35757be6a394ea SHA-256: 74e3367e8c10dd89e078fa946eb74cc8e6037e942040fafca27cca6b75897bc4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate a link farm designed to distribute malicious content, likely through SEO poisoning. While no scripts were directly extracted, the nature of the embedded links suggests an attempt to lead the user to a compromised site or download further 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/wb?keyword=rrb%20ntpc%20simple%20interest%20questions%20pdf
    • http://files.possibleframe.com/uploads/1/3/1/0/131071312/jijonel.pdf
    • http://files.minibaraddict.com/uploads/1/3/1/8/131856317/3290c6d6895a.pdf
    • http://files.trappersrunningclub.com/uploads/1/3/1/6/131607164/658057.pdf
    • http://files.risingearthcreationmyths.com/uploads/1/3/1/0/131070459/8339432.pdf
    • http://files.chapmanatsea.com/uploads/1/3/1/3/131379049/ludanavasi_fodafamutero_xabowenut.pdf
    • http://files.kingdomhvac.org/uploads/1/3/2/7/132710661/norex-dunajilodafu-gatozorusax-kewituvosugir.pdf
    • http://files.nchconference.org/uploads/1/3/1/4/131455621/83f106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sexorewidejo682915272.files.wordpress.com/2020/06/43705382154.pdf
    • https://dunawudawoma.files.wordpress.com/2020/06/xujerexeribulopabasid.pdf
    • https://sugewufuze.files.wordpress.com/2020/07/11731121790.pdf
    • https://fokafogamis.files.wordpress.com/2020/07/valimotoninenanugivifop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/31867794206.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/wojeruvivitibegulum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55079075607.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16481260084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/zavobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/81283089168.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007563.bin
dd0a8b5db1f4a3d9591f695b6a9fdca3a6349aadc379f7bbd7b5afc98d2150cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7563 5244 bytes
font_01_sfnt_off0000870e.bin
87a8c1ff6a5a6dfd0e0bb360a384db8afd630bf6730a8ab88e40339188fd1f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870E 12456 bytes

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