Malicious PDF — malware analysis report

Static analysis result for SHA-256 71461b41ee5b984e…

MALICIOUS

PDF

41.3 KB Created: 2020-10-10 21:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76ba725f234c625b2673893cfcbc5eb8 SHA-1: 78c1969d7e82d066822b1fe7afacb2c39b5e256f SHA-256: 71461b41ee5b984ee35f8a5b78091aa39429344a05848750d07a816cc61a509f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://gettraff.ru/pify?keyword=graphing+linear+equations+word+problems+worksheet+pdf as a known malicious redirector. While many Shopify links are benign, the sheer volume and the presence of the redirector suggest a malicious intent to drive traffic to harmful destinations.

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://gettraff.ru/pify?keyword=graphing+linear+equations+word+problems+worksheet+pdf In PDF document text
    • http://mekerut.bluebutterflycoffee.com/uploads/1/3/2/3/132303189/3558cafe36166c0.pdfIn PDF document text
    • http://files.yourfurry-godmother.com/uploads/1/3/2/8/132814342/7688247.pdfIn PDF document text
    • http://milof.barriegardenclub.ca/uploads/1/3/2/7/132710677/kuvafag.pdfIn PDF document text
    • http://moxowo.seadreams1.com/uploads/1/3/0/7/130775971/c3bd162c8bf25f2.pdfIn PDF document text
    • http://files.isobelchurch.com/uploads/1/3/2/8/132814239/6519541.pdfIn PDF document text
    • http://files.mackeiganmarketing.com/uploads/1/3/1/4/131452732/sodopafesub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1092/8021/files/47968353343.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0069/0845/files/25541267390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0033/4997/files/touchless_bathroom_faucet_oil_rubbed_bronze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/2385009478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2473/0277/files/lehigh_lax_fest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828c382e-4480-438a-bedc-e2c9489960da/bikujojitafaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e097eb-e86a-4abf-9b66-868b28f7deb8/72720857108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd9bfe9-21a0-4881-972e-148eb2520a7f/4955444544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0854425-ec96-41d3-91b0-9ad7f3145db0/11817742674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c29c59f-0cba-45cf-8957-c0ae7fcc42b6/xivebapomik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619B 5908 bytes
SHA-256: d31c37f6b3e415c96b55954e78ca4cd40ec38d19b0b27946f5dc0b7a27cacc77
font_01_sfnt_off00007599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7599 10148 bytes
SHA-256: 75fbdc3d0614146414c544565e22e172c7859c67e831283e6b5e52e89dca7ffa

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