Malicious PDF — malware analysis report

Static analysis result for SHA-256 864851ab154c45fe…

MALICIOUS

PDF

37.1 KB Created: 2020-08-08 08:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a74839bba4a2dd2a01855b3fc408c39 SHA-1: c853d60902c8de269b2f204043c5f0d9743e3ec4 SHA-256: 864851ab154c45fef9be8e18b55e34a95b3518246ff0bf00c9239b91404288c9
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and appears to be a link farm designed to improve SEO for malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of malicious links.

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/pify?keyword=nlt+parallel+study+bible+pdf
    • http://files.basscampmalta.com/uploads/1/3/1/4/131438405/fosug.pdf
    • http://files.flatsfishingonline.com/uploads/1/3/1/8/131872021/dejodod-dijaxunizekuk-bolofiwabixasen.pdf
    • http://files.northmetroweekday.com/uploads/1/3/1/0/131070579/1aea67.pdf
    • http://files.annascafebar.co.uk/uploads/1/3/1/4/131406947/dametopujanoparoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/bafopazafanonovego.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/oxidative_stress_biomarkers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7554/files/jedasapovon.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/2099615017.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/18710290444.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/tudizebikupo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9866/7163/files/60176878713.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/fiwotuwobod.pdf
    • https://cdn.shopify.com/s/files/1/0433/7421/5331/files/buwopazugez.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/notalate.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/81227919247.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/sun_beam_grill.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/92639944355.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_off000050fb.bin
dd1313c71846822b15847cb1d93d848c31007c17baa5136551b56ac7aa2fe9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50FB 5244 bytes
font_01_sfnt_off000062e1.bin
2730141b5244359d121a81270eb46e88b622e0166c461a8d1c5e9a75559d7dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E1 10224 bytes

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