Malicious PDF — malware analysis report

Static analysis result for SHA-256 26685f4eb8554b86…

MALICIOUS

PDF

34.3 KB Created: 2020-08-12 09:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a8b53c32540a77eed5906ea3354aba3 SHA-1: 25f4de68aa56a8dc1fa856998bde439dbd857d26 SHA-256: 26685f4eb8554b86c65e4190199925d4a35158174c850c945566aa5170dfe710
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=plural%20y%20ies%20worksheet'. Additionally, it exhibits a PDF link farm behavior, with numerous links hosted on cdn.shopify.com, one of which is 'https://cdn.shopify.com/s/files/1/0431/1416/8487/files/emergency_care_13th_edition_free.pdf'. The document body contains obfuscated text and the malicious URL, suggesting a lure to a malicious site.

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/wb?keyword=plural%20y%20ies%20worksheet
    • http://files.fransolino.com/uploads/1/3/0/7/130775645/408186.pdf
    • http://files.odazzitclub.net/uploads/1/3/2/8/132815359/vulagidutu.pdf
    • http://files.thebookenigma.com/uploads/1/3/2/6/132682787/sagelakaf_durovenodipem.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8487/files/emergency_care_13th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/nisavidixavixonukakoxavis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2326/0058/files/wepalujumoxunerezadetuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwizesovipijekugufex.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/bolt_nut_specification.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/endangered_species_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4650/files/rezepewidupotelasuxox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1862/files/difference_between_adverse_selection_and_moral_hazard.pdf
    • https://cdn.shopify.com/s/files/1/0436/8341/4169/files/nipitudamarolajabud.pdf
    • https://cdn.shopify.com/s/files/1/0435/4736/1439/files/cyrano_de_bergerac_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/gazetted_holidays_2020_in.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_off00004b5a.bin
6b39e38779b31087b7f876f7f828f52f4b3b4e078038e768652d4e515a9b4bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B5A 5032 bytes
font_01_sfnt_off00005c7f.bin
38b75ba6a06b4df973e7aae70260f35d0eccb2793d959b86c0e8795e54e9ec1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7F 9368 bytes

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