Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9764ab927a6da8…

MALICIOUS

PDF

49.2 KB Created: 2020-09-05 14:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 90a373bd0e0fbe3a2c6b26326a1fd209 SHA-1: 231ae46fa21b2f1862eaf8e2110fe64c35f87931 SHA-256: 2f9764ab927a6da86a9f41544f9142cc414c094e34b318579f69aa032ccb60d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/wix?keyword=guidewire+software+training+in+hyderabad In 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://cdn.shopify.com/s/files/1/0433/8096/5534/files/learn_english_speaking_through_marathi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3123/1644/files/irish_mythology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/buku_alquran_dan_sains.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7020/0737/files/vinokenapame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6231/2611/files/niwajav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/gutadamir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0455/6816/4005/files/geligubol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0616/3105/files/77789197032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4301/0213/files/how_to_add_project_to_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/46045090027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72966212333.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9f2514_48001fe0f6544e8087fde9a76acc57af.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/02beb7_1b495e15b0264576a175e0e7a5e61232.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/98d639_2406ec0fba234c1093d1f7a4551aa9ca.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_95c7f6ad57df4bddbf3a866824462b2a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7f929b_3387d606bfb34ab6b9c5f263176df63d.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_off00006b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B22 5384 bytes
SHA-256: 794b38d1b91c5742c61d4f801139b2ac3fbf28ab6518c9191efe47f89f9cb4f3
font_01_sfnt_off00007d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D80 14088 bytes
SHA-256: 354ec0bd0c6d62615520b772aca78b7cf16fc64fb088830bff67e51c46589ca7
font_02_sfnt_off0000a9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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