Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6f565cdcbec8a6…

MALICIOUS

PDF

79.3 KB Created: 2020-10-30 21:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d4216c4e26e72861eacdbe66f9519faf SHA-1: 9ef7183f7ea83d401f19928c184eadf407747fd0 SHA-256: 0c6f565cdcbec8a66da17bc7da26c4725d517a8913e6becd403a579a24e2d9bf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, reinforcing the malicious intent. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate a malicious document.

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://ttraff.link/123?keyword=penelope+the+odyssey+book+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_5f975698bc5e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f8cc7ddd226b.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/gubaboba-bovunidi-modivusup-bipomoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f9064944c25c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_5f99db711e2d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f9be63933845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5f99a5c29125e.pdfIn PDF document text
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/8032056.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/2560394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_5f97461bdff71.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/8f1ba4f6-8bcb-46e0-87ff-dab950956fbb/30952481838.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/cancun_city_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5561a45-9924-41a9-b686-782c3dc45e36/desomin.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_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 5100 bytes
SHA-256: d135d13c1a5ad6142167deb856284456afa8760ab7dd41c60e0aeb0c1289b93e
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 11160 bytes
SHA-256: 5c56b03e95df28e3dacacced8aeb3e72e3fdea43557cb6fc9beab265c2c9a958

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