Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca153ea80df5709…

MALICIOUS

PDF

41.0 KB Created: 2020-08-09 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8146e6dafd8034490fcd3825d30ddd84 SHA-1: 64305be30a0d60e4ec9b1ffb4daa819a7b63f306 SHA-256: 6ca153ea80df5709983d59f3d28c6820e7d03db74018920e9487f134f6beaed6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary redirector URL identified as malicious. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a compromised site for further exploitation.

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=one%20fish%20two%20fish%20red%20fish%20blue%20fish%20read%20pdf
    • http://files.trendyacresboutique.com/uploads/1/3/1/6/131606697/3338019.pdf
    • http://files.bridgewaterwarmemorial.org/uploads/1/3/1/3/131398093/4d87a1399cddc94.pdf
    • http://files.4thdvpanecs.com/uploads/1/3/0/7/130739971/1208183.pdf
    • http://files.goheendesigns.com/uploads/1/3/2/3/132303314/mevonovivusip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/29775810434.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/44659102865.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/kusejulasamedotupol.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/milusetujozetedevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/76245575545.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/vudimijep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8377/5643/files/29978645849.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8239/0435/files/what_is_a_cog.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/rixijeri.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/fabewijewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/6551284780.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/76222333225.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/babbitt_alloy.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_off00006293.bin
996cbf2f7de011a2bf9619e54310ab3a5a63c92554585fbce5633bd141d64713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 5388 bytes
font_01_sfnt_off000074ea.bin
ef129c383fdd30bd26fa789898b4657c7fd91527f6cff0f9e52da2e1e89d1033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EA 9920 bytes

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