Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5504c517da61c50…

MALICIOUS

PDF

35.1 KB Created: 2020-10-20 22:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1bf8e485814494067bf860d2364a72d0 SHA-1: 9a273988bc4f458fa05078d5e5e9917f5809313d SHA-256: a5504c517da61c5044e78766dfe01259f77a9bca137c8a8f20ddbfb76b30f65c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to unrelated Shopify-hosted PDFs, suggesting a link farm for SEO manipulation. One prominent link directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the URL for the malicious redirector and references unrelated PDF topics, further supporting the lure.

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://ggtraff.ru/strik?keyword=toefl+itp+grammar+book+pdf In PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/4513866.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/rusew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5f8c4c75890b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f892215a2783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f8ae61f4dac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f888244a9aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8ab8adf0c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f8a9eeaa7cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f873267ea328.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/1/0500/2179/3942/files/wow_classic_shaman_leveling.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8725/6480/files/zosajezub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5772/4578/files/lifalenowujunugam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7784/2597/files/ligixomipegasopawiji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/82166839821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9779/0366/files/kitchen_tools_and_equipment_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1512/5662/files/sejarah_sastra_indonesia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2386/8319/files/xetejevevizejubibupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31584c29-7dc9-4de5-b400-07b1a98b72fb/71136436289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc688f6-ae1d-4788-a298-4799f8dbe596/25376176608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c35dea-7ee2-4005-9639-1ae5f8da95bd/zobafavapisozoravid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b176e526-a31a-4dbc-943c-cb2a8323f204/61521277902.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_off00004c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C80 5336 bytes
SHA-256: 9ba726623c9814c38d7be1f97a7c5b368674a9ae91f439c70851b5764d11167d
font_01_sfnt_off00005e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E93 9704 bytes
SHA-256: d1f04da3d00f57be3689906d725f9625cb58ae23ba053b91211bf2d2bca61e1e

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