Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efb0146ee1cda4c…

MALICIOUS

PDF

39.4 KB Created: 2020-10-23 02:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 446712ddaf707aa5ec09e832d66201d1 SHA-1: 65efdf5522a329ba4bffaaac1f9921fe234f8181 SHA-256: 9efb0146ee1cda4cefbb4993cb4e6ecae105b13b5495d92bbb68c8aecdc8194c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to known malicious redirector infrastructure. The document body and embedded links suggest a link farm or SEO poisoning attack, aiming to drive traffic to potentially malicious sites under the guise of providing PDF downloads. The ML classifier strongly indicated maliciousness.

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/wb?keyword=glossary%20of%20geology%20pdf%20download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f87209f1de80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8a41d09e22f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/vinakafejimalosopuri.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/fundamental_beliefs_of_a_muslim.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/76811660408.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/27233359128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/common_core_geometry_constructions_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4628/0609/files/dua_for_traveling_islam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9038/1473/files/47519012769.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2642/9605/files/jadalasimowelatininaligil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327a4bcc-96db-46a1-865a-67f94ef26cda/los_vedas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5a075a-8048-493c-a812-0012878b8503/ruturezitarosule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db57e71-d4f5-445e-8204-98ff1a381253/zopogelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7437229-c608-4950-9567-d5cbda0d2f00/lunewinaga.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/buffer_overflow_attack.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/82465873561.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/napusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151c227a-9522-4227-930b-f3a282e287cc/10561957255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc0ddcd-a55a-44be-9205-a51824905e7c/xanefid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2454c5c8-1401-4257-ba9a-858037c4cc03/xerosupeboxedewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e3b238-c524-41a3-8a2b-903a7e9c58a8/28039225782.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_off000058a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58A2 5436 bytes
SHA-256: 9575d7cbc36512cc537fc3c6ca5e5ffc07251c1a98ae81fbcfd2de8ceca873cb
font_01_sfnt_off00006b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4D 11072 bytes
SHA-256: 0bf18cf35193c37e91b2bd52998db60d0920f242e6d0ed653eb879f3a03330e7

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