Malicious PDF — malware analysis report

Static analysis result for SHA-256 5389b88741795035…

MALICIOUS

PDF

41.4 KB Created: 2020-08-09 19:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 950141a3f2fd3bdba50d540d53b303fc SHA-1: ae2a77c32dfe97182ad8bc665b82dbb764b93f8b SHA-256: 5389b88741795035c8d2c7bc0efbc0ab58b71acae5b5a1c69bbf76cb1e88f586
120 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=discrete+mathematics+textbook+pdf, suggesting a lure to download a textbook. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous links, likely for SEO manipulation or to distribute the malicious payload across multiple domains. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=discrete+mathematics+textbook+pdf
    • http://files.aabmbass.com/uploads/1/3/2/8/132814972/kalar.pdf
    • http://files.birthbygracemidwifery.com/uploads/1/3/0/7/130740483/6e0c9bf4.pdf
    • http://files.suemediaproductions.com/uploads/1/3/2/6/132695543/wosinefivududojizaz.pdf
    • http://wawenupum.midlandsallstar.com/uploads/1/3/2/6/132682646/suzedo.pdf
    • http://files.drstevenjadlow.com/uploads/1/3/2/7/132710712/44c5392e2ad3bf7.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/71886119290.pdf
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/derelefiwizuwadup.pdf
    • https://cdn.shopify.com/s/files/1/0441/3957/7496/files/pemumubanizenezu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/895794923.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/xamilufodo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/woxaso.pdf
    • https://cdn.shopify.com/s/files/1/0429/0753/3475/files/theory_of_computer_science_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/43307181509.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/the_most_dangerous_game_anticipation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/rezaxesus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/xuwugir.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_off0000624c.bin
686fc644ff2ec750ca132c0e05f4d292fc33d2f6de6770f518d049841834b16a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624C 5636 bytes
font_01_sfnt_off00007547.bin
4d9eeccd95330a56f1bf1982a6bbc7622bb5c788dad1ad1b70ba1a4b36c832a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7547 10428 bytes

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