Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92bfef2a66f52fe…

MALICIOUS

PDF

44.5 KB Created: 2020-09-06 04:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24621d0729043aa647e445550239bc57 SHA-1: ef1ce9e2d59d3d015c205930fc0b443ec31d66ba SHA-256: f92bfef2a66f52fed3cd4cc486d4b3712f17575e16344b5542adbbac51577fee
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware delivery. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'belageddu song karaoke'. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this document. The primary attack vector appears to be directing users to a malicious 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.club/wix?keyword=belageddu+song+karaoke
    • https://cdn.shopify.com/s/files/1/0444/4743/2871/files/99968071580.pdf
    • https://cdn.shopify.com/s/files/1/0465/3236/2390/files/boxed_company_information.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/amg_felgen_gutachten.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4354/files/43788246295.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/tera_nova_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7939/files/17483159331.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/bartlett_tree_research_laboratories_technical_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/12909790434.pdf
    • https://cdn.shopify.com/s/files/1/0461/6752/3491/files/spaghetti_dinner_flyers.pdf
    • https://static.usrfiles.com/ugd/d2759c_c44dd4f2537a461d88097f28b35a0c3a.pdf
    • https://static.usrfiles.com/ugd/8e1900_b36885b340d64941bc5955d3eeda030e.pdf
    • https://static.usrfiles.com/ugd/2c76f4_58c87167b586442cbc849a0723eeac02.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/47065252693.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/chargeable_assets_acquired_form_11.pdf
    • https://cdn.shopify.com/s/files/1/0446/9476/5724/files/axolotl_care_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/31501416433.pdf
    • 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/
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/b

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f64.bin
2638e95099e62caa2b3a59e266231fa41cb67d14cc1e4c18a361b69c1a806e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 5104 bytes
font_01_sfnt_off000080d4.bin
2f8b1dd820cbb3f2e893bed6f68bf224a7c4283de8be27c2f9e4b0c0e054ddf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D4 10512 bytes

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