Malicious PDF — malware analysis report

Static analysis result for SHA-256 7773c6fe9a6b32d3…

MALICIOUS

PDF

37.8 KB Created: 2020-08-15 17:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f369fa88d59a2d2d6cc8cda34d86fd9d SHA-1: a071034996f2cedce9bce359b0984d79bcdaf0b3 SHA-256: 7773c6fe9a6b32d3d647c7dbf883cfc9c2b04f3256f737f0f92a5db7b6a4d2f3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to drive traffic to a malicious redirector. The primary malicious URL identified is https://ttraff.com/wb?keyword=basic%20adjective%20list%20pdf. The document body, though heavily obfuscated, contains references to URLs and appears to be part of a scheme to lure users to external sites.

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.com/wb?keyword=basic%20adjective%20list%20pdf
    • http://files.wymanbrent.com/uploads/1/3/1/4/131437249/5255696.pdf
    • http://files.explorestanton.com/uploads/1/3/1/4/131453216/6741733.pdf
    • https://cdn.shopify.com/s/files/1/0439/2232/5672/files/fundamentals_of_computer_graphics_4th_edition_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/blank_resume_format_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gijamibumiji.pdf
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/7477889007.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/bipabudobasusapumesel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/dutaziwapakoravaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/wirojirudegid.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/weber_grill_repairs.pdf
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/xebenafugukabotaxitoguwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/44260477012.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_off00005675.bin
738672587ed683ca0e5ad75dc69c65c9b9d0304ff7e9c9e14272a047fc7628e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5675 5236 bytes
font_01_sfnt_off0000685d.bin
de7d64d13e6d0275ae1832ef16c08ce286fdce63e9e3291c7f89aec3137f0beb
pdf-font-stream PDF embedded font (sfnt) at offset 0x685D 9996 bytes