Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd38d7c6967a18b…

MALICIOUS

PDF

44.0 KB Created: 2020-09-30 06:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8ebba5f3b8369d0f2f5be3c3b5a032b2 SHA-1: 4f9e0eaf8ab305498cc59fd11c8126a1dc76eaf6 SHA-256: 8bd38d7c6967a18b9482e748003c366d82ea66978966f0854a0bdb788f80317a
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://gettraff.ru/strik?keyword=bromatologia+composicion+y+propiedades+de+los+alimentos+mendoza+pdf In PDF document text
    • http://files.sailorstclaire.com/uploads/1/3/1/3/131380029/zuweranagipiriwekuve.pdfIn PDF document text
    • http://files.mentororchestra.com/uploads/1/3/2/6/132682930/wanelawosevapok.pdfIn PDF document text
    • http://files.findlaybooks.com/uploads/1/3/1/3/131380397/lowobumuwaseju.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://cdn.shopify.com/s/files/1/0436/9691/4587/files/ashrae_acca_standard_183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5148/7910/files/woods_timer_manual_50014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1795/9586/files/dermatix_clear_silicone_sheet_scar_reduction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/31724826424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8945/1425/files/15469770847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/83062961688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/28680423904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1557/5464/files/auditing_and_attestation_cpa_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/tefelogage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/what_is_biological_weathering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1673/5898/files/36656429655.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_off00005975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5975 5464 bytes
SHA-256: b9a484306928fe30e7f3ccadf058229a5999b29058d9eff37eec4ea0d9bb5da4
font_01_sfnt_off00006bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 11684 bytes
SHA-256: d51afb68dfbd4b73ef1efd3af4f73c8a8c34db716cfbdc73932c3d03cd67a4a1
font_02_sfnt_off00009218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9218 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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