Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e66f732230f6c00…

MALICIOUS

PDF

40.9 KB Created: 2020-08-26 14:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b4d36ed5efb73cb0a4334a62769fae9 SHA-1: 2b6cd76b31615395bff1497e442687c5618b8d6d SHA-256: 9e66f732230f6c00684eab1fbd8490ef64fc659f6308c791fa2ccc2a42e7c87b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a malicious redirector link and a large number of external links, suggesting a link farm designed to direct users to potentially harmful content. The presence of a "download button" lure further supports a malicious intent to trick users into clicking through to the malicious infrastructure. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=construire+un+graphique+cm2 In PDF document text
    • http://files.byrdsworld.com/uploads/1/3/0/7/130739731/pofabu-sitomu-namovewojigolip-giviwifadokix.pdfIn PDF document text
    • http://pumegid.leichterleben-energetik.at/uploads/1/3/2/6/132682787/nosinu-bomov-zemokosu.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/1/0435/3399/2085/files/85746139664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2781/5833/files/paxezesaximewisotasobe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/35200229598.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/60267759601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8732/1505/files/jirawalapapaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/rubber_sheet_manufacturers_in_gujarat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/5803/6641/files/escape_room_level_225_answers.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_off00005e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3D 5476 bytes
SHA-256: 543b7c3a2a15b237bbaeed3cd8d9ff0cd928362ceafb0d5353b85ec24541a82d
font_01_sfnt_off000070b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B5 11684 bytes
SHA-256: a7ab4896b1ec2052f24ec6c50c5ff47dce04f444e7d93d61fe4887b292491961

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