Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b44b8a53dc3b8c5…

MALICIOUS

PDF

39.9 KB Created: 2020-08-20 06:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67fa8349a5bdd20378659920fb07dc46 SHA-1: f9b0c89f2ee5184886bcfc83479fd2fc9be22691 SHA-256: 3b44b8a53dc3b8c59a8c06e6e32e5d5e8d143d3870f4d8eb1bd719be4ba9d0cd
160 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a job description template, aiming to trick users into clicking it. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many pointing to seemingly benign Shopify PDFs, likely to obscure the malicious redirector. The SE_LOLBIN_RUN_COMMAND heuristic suggests that the document may contain instructions for executing commands, potentially to download and run further payloads.

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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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/pify?keyword=customer+service+associate+job+description+template
    • http://jozupam.crrcinc.org/uploads/1/3/1/4/131454215/tuzem-vaseviv-zawezok-bokikugetoz.pdf
    • http://files.gwionraven.com/uploads/1/3/0/7/130739776/4916943.pdf
    • http://files.taichinyc.net/uploads/1/3/0/9/130969699/2601755.pdf
    • https://cdn.shopify.com/s/files/1/0435/9441/6290/files/english_grammar_book_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/61244072869.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/31075505860.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/65777674556.pdf
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/9397252170.pdf
    • https://cdn.shopify.com/s/files/1/0434/8071/1325/files/sasenesozukud.pdf
    • https://cdn.shopify.com/s/files/1/0437/1592/0024/files/coenzyme_q10_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/powershell_impersonate_user.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/futexefomisamevenelexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9107/files/public_sector_accounting_and_finance_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/raritawe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/meio_ambiente_e_sustentabilidade.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/32254633073.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e14.bin
8edf9901cd00c351173e5d45b29d31002fc55ba25c416ebd5fb308f04ec65486
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 5400 bytes
font_01_sfnt_off0000705a.bin
a06a232e6a42243e8fa8903b3616e1c8d693d980a0f476f64a1e036a37053b67
pdf-font-stream PDF embedded font (sfnt) at offset 0x705A 9964 bytes