Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa185a7d37ac1e3d…

MALICIOUS

PDF

46.4 KB Created: 2020-08-10 18:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78bd1c55df36b0ddca08e9c5fd5f971d SHA-1: 9a7a479921dab2e2ce8ce2aacadd4cfe23831ab5 SHA-256: fa185a7d37ac1e3d9b0db087b1be256b86f91ffd0c17aed74067049bd1608cd9
120 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, masquerading as a worksheet. One of these links, 'https://ttraff.cc/pify?keyword=two+variable+equations+worksheet+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL, suggesting the primary intent is to redirect users to malicious content. The file was generated by wkhtmltopdf, a tool often abused for creating malicious documents.

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.cc/pify?keyword=two+variable+equations+worksheet+pdf
    • http://files.tonystledger.com/uploads/1/3/2/6/132683267/letegilepatovuvaxi.pdf
    • http://files.drmichelle.me/uploads/1/3/0/7/130775471/5765636.pdf
    • http://files.crystalconnections.co.uk/uploads/1/3/2/6/132696233/4075180.pdf
    • http://files.musetechnolgies-unite2.com/uploads/1/3/0/7/130776277/xosapidutubakikifi.pdf
    • http://files.ericheerspinkceramics.com/uploads/1/3/0/9/130969481/0e5df66.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/35346558955.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/fexesogepudijiraxagel.pdf
    • https://cdn.shopify.com/s/files/1/0454/5308/2782/files/25649954532.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/15804913156.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/35373121612.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/gevixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/machine_learning_bachelor_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/movex.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/pa_drivers_license_center.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/graphene_oxide_fundamentals_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/9443725736.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/19409412823.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/danurezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/descargar_biblias_antiguas_en.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_off0000761c.bin
5a24f7e581ef07e414bd02bafe9c1716c2a770b0349c0ef4b9f9fafe80ae48f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x761C 5560 bytes
font_01_sfnt_off00008908.bin
e128b7d08d51aa80516f6a15340a83741bec8f7e04486ca21be2f1f39025e80a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8908 10340 bytes