Malicious PDF — malware analysis report

Static analysis result for SHA-256 c055ffea79efbe25…

MALICIOUS

PDF

33.7 KB Created: 2020-08-04 06:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8e8b3e9cfdc012f19c2ac83ab32804c SHA-1: 5f2d1752b634b113d29eb3073116aaacd1f875a6 SHA-256: c055ffea79efbe25bab63d82350b751ca612d097cdb323bf344977496e34ea62
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a link farm strategy. The ML classifier also strongly flagged this PDF. The primary attack pattern involves redirecting the user to malicious infrastructure via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=diccionario+biblico+nelson+pdf
    • http://files.montebaldoorbust.com/uploads/1/3/0/9/130969592/zadenujoz.pdf
    • http://files.elyriadev-center.com/uploads/1/3/1/8/131871555/vofegidonirotozupu.pdf
    • http://files.communitycouncilma.org/uploads/1/3/1/1/131163492/5256f.pdf
    • http://files.lawwithdenise.net/uploads/1/3/0/9/130969291/823263.pdf
    • http://files.ashaniketannandibazar.org/uploads/1/3/1/6/131606262/famogosesibaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/51544458837.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/eaton_breaker_types.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/11709985892.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pizejop.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/puxadaxunuxanusigevir.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/67833196421.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/bawegemusugurenukovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujufizolotedugogu.pdf
    • https://cdn.shopify.com/s/files/1/0446/1946/4867/files/chemistry_for_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/jifaba.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/birewekovoninajaj.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004715.bin
eb77887e6c2819528cf54cd76952767f0999c92522cdad1b34549a1ae0403ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4715 5288 bytes
font_01_sfnt_off0000591f.bin
722ab9b844d7ff9a4eab3d8ccfaac0016dad3757431a232d65e1a5a346d2e89f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591F 9616 bytes

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