Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcd76317800ca9a…

MALICIOUS

PDF

52.0 KB Created: 2020-10-28 04:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 355c102e0114920f061eeb46b173fb64 SHA-1: 011b15d073f07556600d02aee697b7e1ec0f1f27 SHA-256: 2bcd76317800ca9aad6d70d520ecb9638becb41513a8d5ee16547d5767c00765
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings, suggesting a link farm or redirection strategy.

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/strik?keyword=ffxiv+desynthesis+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f88bd7b31549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f8fb12879acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5f96f5363beb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f926ee8e9e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5f9573223893d.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/8f6d30545.pdfIn PDF document text
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/2350211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81c8c1f-63df-46b0-9d18-2603343aca00/wibosizuroka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a43283-3b19-4c81-837d-4b5dde70817d/vemobususejevovilegap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575e47b9-85ed-4afd-8504-be19782c50e2/woxivisogugerezurotituwak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4335/8373/files/27475025572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/mathematical_analysis_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/minecraft_fazon_uhc_ip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5699/4721/files/76156582529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8792/9249/files/sat_practice_test_1_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9c620a-b3c9-4ff4-9f3d-4e40d4ec39d6/15522389475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e82e04-d877-4980-88c2-87e8680e73e7/3932539398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bfbf67-6795-4552-90cc-1e4f292d85a1/52065887829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78e3fc7-1665-4762-b3bc-c848302df8a6/sivoxizidok.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_off00008c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0B 5016 bytes
SHA-256: bb98753b6720ecc08bda475ecbbb159e9d0026f9b447a72239455169ca23de4b
font_01_sfnt_off00009d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D33 11124 bytes
SHA-256: 166b5dac461ef599050ac252159787a4925a28a3e3285ce7e3af3edb0c002a7b

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