Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b4037a4f367553…

MALICIOUS

PDF

85.3 KB Created: 2020-09-22 19:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3790b6b6ae9043d40e4d405c4ae013f4 SHA-1: cec2a9af18307a1f4e37842ca74d4cf7ba968878 SHA-256: 34b4037a4f367553f5520bdecd974f10983fd088e353b1b33ab24c6b00711050
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link disguised as an educational worksheet, which redirects to a known malicious domain. The ML classifier strongly indicates maliciousness, and the PDF structure includes a mass external link farm, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The primary malicious IOC is the redirector URL.

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.ru/wb?keyword=heart%20anatomy%20and%20blood%20flow%20worksheet%20answers
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/hotpoint_bwd129_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/71462066586.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/67687997438.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/80229684025.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/63449489943.pdf
    • https://cdn.shopify.com/s/files/1/0438/6809/4629/files/rinorusovoletegaduxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/android_versioncode_version_name.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/step_8_and_9_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/90531193554.pdf
    • https://8d28df9f-35b1-4153-a5ee-bf7a4c17f437.filesusr.com/ugd/23a6c3_ccd8bd1300b546a38aa458192750a3de.pdf?index=true
    • https://66d1a827-8c79-4a7d-b2ed-c6c858ec7988.filesusr.com/ugd/a4c1fa_a743f8cf53884503b705f9f33f4fc844.pdf?index=true
    • https://45e3dcfc-cfef-435c-a0d0-c13526f42f96.filesusr.com/ugd/0b46e6_ff75be9059eb4ca9baa250f155bfa688.pdf?index=true
    • https://fdd8fd87-a2e9-4df8-bef1-25ea00b70809.filesusr.com/ugd/3d514e_ef1d275d75f047eab0a1ffe87d067a89.pdf?index=true
    • https://088683d4-c44b-49c2-948f-99b53ead6bfe.filesusr.com/ugd/e33828_aadee373ea44487e9cfd6097c1368efc.pdf?index=true
    • https://c1512a20-8cf2-4578-8502-b84892f3cb37.filesusr.com/ugd/197ed4_60b7de3b19a644a3b19a82e90beb30de.pdf?index=true
    • https://3e9f863b-d6b7-4c76-a529-fe18d7f6a3e1.filesusr.com/ugd/625844_4eb126da6eb94b3e809aa7951ce256b5.pdf?index=true
    • https://0274bdb4-76ba-449c-8dac-941868fd6a2e.filesusr.com/ugd/4b68be_8f5ae46253df4edda9cac759e44e51ba.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ab.bin
d3bc174613588b01c46c734cc26d25f056631959458664cbe345be8fd9310373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 5508 bytes
font_01_sfnt_off00012450.bin
97be3bbb3a23b38903172d8299f65d068ecc1e1535d57bb8187c07a9061045eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 10344 bytes

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