Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6674c81fba3688…

MALICIOUS

PDF

42.4 KB Created: 2020-10-27 02:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 284506219dc9da583fc2a376edd618f4 SHA-1: dcd2fc2c1fb5dd0d1bdb243569b25709464ec215 SHA-256: 2a6674c81fba36880479b956083ebe3b86b35452fd6b7b4bd9e3a32a639c1228
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external links, many pointing to file-hosting services, suggests an attempt to obscure the ultimate destination or to create a link farm for SEO poisoning. The ML classifier also 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/strik?keyword=greek+decoder+math+worksheet+answers+cc-54 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8d464e0db5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f870710e0cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f918fc17250b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f88f6fc5ed99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f908ed6bc0e8.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/bugar.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/987b21c6b.pdfIn PDF document text
    • https://sofuwikomu.weebly.com/uploads/1/3/4/3/134308783/golapob.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/sexate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f891cc061cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f947ccd9f3c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5f8fd0abb1324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f97526eceabd.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/cc02dac5-f33f-45b5-a11a-74bb44cdfe4f/lotanuterasobufunewon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67b5997-49a1-4fc6-85a0-3bfbbff05c1e/white_pages_davis_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b342120f-ccd1-4bb0-a300-7755f273c4d8/human_anatomy_and_physiology_10th_edition_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef563b60-bd8e-4114-a3c4-b100d611d2be/nuvuti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2018/7805/files/dd_5e_grung.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8763/6896/files/microprocessor_gaonkar_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4456/1319/files/vedevixuzesajasan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3149/3306/files/lipanag.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_off0000656b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 5580 bytes
SHA-256: f6454e33a0b2471550de9a9f57f9ad6522546903e1b16ed2c9d4d783d4ccb20d
font_01_sfnt_off00007864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 10412 bytes
SHA-256: cbf4b4bb47a58013a500ceb5d5c51eb1dd22890cdee1e8a783ffb0f837f664f0

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