Malicious PDF — malware analysis report

Static analysis result for SHA-256 7431c84527fd1fae…

MALICIOUS

PDF

50.0 KB Created: 2020-10-28 22:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8a934b5cb706d6eb790b91793156c0bf SHA-1: 33b1519d103a377cee044573a06841194a4cc380 SHA-256: 7431c84527fd1fae7e88032f8e1233e3adea8b59951f696fcbd2193ff259d602
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 link farm with 28 external PDF links, one of which directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest an attempt to drive traffic to potentially malicious or SEO-manipulated content.

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=pirate+ship+tattoo+traditional In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f8bdb6bbc293.pdfIn PDF document text
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/4035420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f94719ca35f3.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/d4a98fe1c.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/zofoxibivogub.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/6035995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pisedij/the_adventures_of_huckleberry_finn_penguin_classics.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/jizafu.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/agreement_on_safeguards_wto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc437a7-ab0d-4fa1-83f1-fa50a9e7b652/29088102475.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/basic_knowledge_of_civil_engineering_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/canaletas_para_cables_de_red.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/volkswagen_vanagon_t3_official_factory_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/letepodopuxij.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_off00007ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE9 4836 bytes
SHA-256: bccdc78226e725c794b4a2c4304ee9264db32bd43ef0e959971b5a59d3d22795
font_01_sfnt_off00008b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 9868 bytes
SHA-256: 88a75a7df5252d9176c235dd6472d75114cac15af4a3f88b59aad4814c9e8297
font_02_sfnt_off0000acf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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