Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c445fa4ccc1988a…

MALICIOUS

PDF

65.7 KB Created: 2020-12-23 15:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 70070e91e5c33b0c096158dc151c815c SHA-1: 3d2f73c5a1a6211736dd5ac3226bd0c2dbeffb67 SHA-256: 2c445fa4ccc1988a16ea76a4f777cb3a57decd661e9c97c7306a73eb5ec512bc
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create SEO spam or phishing pages. The presence of numerous external links points towards an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=very+sad+status+video+for+girl In PDF document text
    • https://wojopukutipu.weebly.com/uploads/1/3/4/3/134345686/74151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8d6a7fd60f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_5f9f9b5b1aafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_5fc80adaa1c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_5fae70d5e66e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5faad39e2a88c.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/8008444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5f90f14d0eed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_5f8e5aecebb04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_5fad45a34aa0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5f9bcf88ae812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_5fda0fb923d2a.pdfIn PDF document text
    • https://pimizotola.weebly.com/uploads/1/3/4/7/134770615/nejolobile-sizakotile-lunapuvib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f9b8fec388ab.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/89a3189f-0fa5-45fb-8f5c-73edaf845350/freddie_gibbs_and_madlib_bandana_dow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d802f1-2ca0-4a8d-b332-abf325f7bc31/jiper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5527ce73-8dee-480e-9f3b-6a029c2ff802/kegajirabepubewizitof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 5200 bytes
SHA-256: 11e1f24e27fe6c405691166dbb815b2581973fcd7566183348d5401170ff0bb7
font_01_sfnt_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 1792 bytes
SHA-256: 1b46d5bc4fdbf0d6fe8c63cd43ee594182eadc69f4e4c2f28049411ad73c8202
font_02_sfnt_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 10420 bytes
SHA-256: 2b2b2d295d5c5944a8b8dd1cb931d2962542e3c05b970acd0c3afa2d280b4a8a

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