Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b2498e83151ef0…

MALICIOUS

PDF

55.5 KB Created: 2020-09-18 04:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90201f79667367baf861be4823a4773b SHA-1: 3105598d5ef05ac7bd3d16e929c4a7472339d19a SHA-256: 63b2498e83151ef0dcad3b207adf87b60005ddaffdfb20ada01c04063448b18a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious intent.

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.me/wix?keyword=midpoint+and+distance+formula+worksheet+answers+key+geometry
    • http://nevawuti.uwanetballclub.com/uploads/1/3/1/3/131380345/2543028.pdf
    • http://bajanogo.roslyn327.com.au/uploads/1/3/0/7/130738962/371aaa45c8.pdf
    • http://files.brothersphotographers.com/uploads/1/3/0/7/130739892/ec67a2bb4035a30.pdf
    • http://files.eastsideveterinary.com/uploads/1/3/0/9/130969190/gosezapim-ravabateb-vizonipe-fopudipabak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7422/3269/files/family_tree_craft_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0714/files/totarer.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/takokexejadagetigufulig.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/consumer_rights_class_10_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/berar.pdf
    • https://cdn.shopify.com/s/files/1/0437/9253/1617/files/nuvififamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/91461670814.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/rosakuxasuluboxosoxapoleb.pdf
    • https://a25e3a1d-121c-4a91-a913-6055d86a44ed.filesusr.com/ugd/6f5f23_41b5b8edd7574488b0f09b73ac1d880b.pdf?index=true
    • https://663636f4-a056-4380-8713-a70cdd441f41.filesusr.com/ugd/0d018b_1be18c89a9754466a1dd60f4bd6d9427.pdf?index=true
    • https://47d85dff-4368-43bb-ad08-01b18d5a1869.filesusr.com/ugd/3225da_4a7cc65405e44c82855752b4f8dbe229.pdf?index=true
    • https://2f862644-7297-4be1-83b2-94d208600302.filesusr.com/ugd/f2c1dc_c1ed8ffe3c714a7d949fcfebadc303bf.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ce0.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE0 2828 bytes
font_01_sfnt_off000096db.bin
e56802f57087697ee2ed24d46be6b69d21b944a58d8756841821b0157036c605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DB 5832 bytes
font_02_sfnt_off0000aab7.bin
b7683e6a684d2864c066a0553021fdcf4335705ec60d4d74ce2ff0f4a7792875		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB7 10308 bytes

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