Malicious PDF — malware analysis report

Static analysis result for SHA-256 953c801f5aec2cf4…

MALICIOUS

PDF

35.5 KB Created: 2020-10-08 06:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a75999a71a8a9ae0a28874f3122aff2d SHA-1: 35cd6b1328d3cf3c5aba0465e4b4da25cff165cc SHA-256: 953c801f5aec2cf4d5f7fdb530fa0e503a0ff89301f713ec45d72238bdd4b87b
154 Risk Score

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 malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing attempt, aiming to direct users to malicious infrastructure.

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/strik?keyword=teologia+sistem%25C3%25A1tica+franklin+ferreira In PDF document text
    • https://site-1043408.mozfiles.com/files/1043408/47487473434.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/zosim.pdfIn PDF document text
    • https://site-1039889.mozfiles.com/files/1039889/domekadalov.pdfIn PDF document text
    • https://site-1038851.mozfiles.com/files/1038851/79552809986.pdfIn PDF document text
    • http://files.alcoholandfamiliesalliance.org/uploads/1/3/0/8/130814408/zeluropamafi-dawim-bupegitusu-zuvoketom.pdfIn PDF document text
    • http://files.quietwaterpublishing.com/uploads/1/3/1/6/131637873/1a6b8416ca8.pdfIn PDF document text
    • http://files.1320am.com/uploads/1/3/1/6/131606331/3f1f779a3af5076.pdfIn PDF document text
    • http://files.mutleysmiracles.com/uploads/1/3/0/9/130969061/4695941.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/1/0437/6412/1757/files/prospect_elementary_school_cleveland_tn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/74958183770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1866/8197/files/22272276003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6046/1220/files/nojozod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/2921005813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5c62ff-46cc-4512-84c7-f54015b7dc6d/xatobevas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b6c5e4-16a3-4974-8400-f6514ae0e840/majomefagededenokitabow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9462b4-9260-4b49-9151-20ab50192a98/69726413488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897852e6-984e-4ef6-8350-1a3ed47b56fd/77897874757.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_off00004a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A50 5448 bytes
SHA-256: f78c0a742d50c397a64e3e59e010290d2209dca198b3141a508dbacf5ee9fafc
font_01_sfnt_off00005c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3F 11304 bytes
SHA-256: ce28cdabdb5012ce45e4fe31d29202dd8722201fcd182227827b9348f6da4241

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