Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef27079d6f30c57e…

MALICIOUS

PDF

43.0 KB Created: 2020-10-24 05:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7b8ce3451f3ee1cb908c57990483d08b SHA-1: 46444d167fdd5cd61abb6f110afa2acc25210e83 SHA-256: ef27079d6f30c57e683fba0cf2a3909b8759b45d22ec16665eb6472d8bbf82b1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings of a link farm and malicious redirector.

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://cctraff.ru/wb?keyword=tram%2028%20lisbon%20map%20pdf In PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/1270511.pdfIn PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/tanedajex.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/balatifi-birit.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/0510e770fb99.pdfIn PDF document text
    • https://duririsi.weebly.com/uploads/1/3/4/0/134096382/832527.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.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/1/0501/5837/0991/files/80188304740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/instruction_set_randomization_security.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/assembler_jpeg_en_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7025/5004/files/smeg_dishwasher_manual_pl_623_x.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/iphone_users_vs_android_users_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb272419-c2d4-438a-aa08-c0d4f5d2ac8f/fexitususaxejolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a61e8ea-0444-42b7-b41b-fb7c8c82c148/11561572038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9368/3104/files/zekelekesuzudowivib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/38823257554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98dc007a-4909-4f0d-b55e-418814ab01b0/mawisogulabodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff3924d-ad6e-4e2e-952f-47e498408e3a/fetonagalupamibapunip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3624af3-98b7-44bf-bb27-ed721781cf59/jupizibuxeforixevuvewag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae4c728-768f-4ba0-8851-21789347c110/rc_sproul_dust_to_glory_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50c47d7-fe80-4a2c-ab0b-d55d646f9a94/28186062019.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_off0000679e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679E 5600 bytes
SHA-256: 2dc60839293a8eb896ee9f7a878ad5ed996722c9cad599ff078fe8055a167224
font_01_sfnt_off00007a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A82 10960 bytes
SHA-256: c4c48fa40c3482f58fef7b14ba1d0b43db19810f3c8de26775bd2c4ef650bcd4

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