Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b2a4f9e8e26f16…

MALICIOUS

PDF

32.5 KB Created: 2020-09-18 20:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed45ecf17a443eb00541db410a530c35 SHA-1: 13c2a75d59a4349247f3222a6e630208bcfc95f4 SHA-256: f7b2a4f9e8e26f16c666104a009023dce33a2ad9d28cee38a833cde8163f94f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a significant number of embedded links to external PDF files, a technique often used for SEO manipulation or to host malicious content. One critical heuristic identified a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector strongly suggest a malicious intent to lure users to harmful content.

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=partial+quotients+lesson+2.4+answers
    • http://files.solidrockmasons.com/uploads/1/3/1/1/131163736/xoferemo.pdf
    • http://files.themissionhallproject.ca/uploads/1/3/2/3/132303312/noboga.pdf
    • http://files.westburybondreferendum.org/uploads/1/3/1/4/131406140/6015173.pdf
    • http://terik.wedhockeyleague.com/uploads/1/3/1/0/131070581/1385628.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/lululemon_size_8_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3371/4070/files/heroes_and_generals_tanks_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/87764583215.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/bipab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/xml_vs_json.pdf
    • https://cdn.shopify.com/s/files/1/0434/0088/8483/files/valley_east_days_2018_bands.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/the_complete_bartender_s_guide.pdf
    • https://8ea0792b-a985-4fa2-aff6-0623869af746.filesusr.com/ugd/77941b_58debbb9d2164f7395da74f238e49665.pdf?index=true
    • https://955ec184-5c75-465b-ab6a-96b7f325a6ff.filesusr.com/ugd/b916f4_6f75bfcca876400593ecff4d0335f7d9.pdf?index=true
    • https://09bb25eb-894e-4177-ba73-bbafc565ccf6.filesusr.com/ugd/6f5f23_5d29b37f3a7245bbbf43e4030d0e2e20.pdf?index=true
    • https://04efb7a1-05c7-43d4-8979-5bc6826d0841.filesusr.com/ugd/0df15e_8be7f1645ea64640a6f3cbd582116e0c.pdf?index=true
    • https://b7543e8d-189b-4899-8e21-7e4a377373ab.filesusr.com/ugd/3be3a7_8656a2353f3642f399952a56438056aa.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_off00004561.bin
79a1423a1ba687d73ad80e34ee27588042e9effdb346f84b3f918dff1d743f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4561 5148 bytes
font_01_sfnt_off0000570d.bin
3ca5bac5494f36252eee6e31bb948b171e26be5a2432ac7d9b384cc1d2deaa73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570D 8828 bytes

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