Malicious PDF — malware analysis report

Static analysis result for SHA-256 d933d14e8aa700fd…

MALICIOUS

PDF

42.3 KB Created: 2020-08-13 16:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c97dde73a2a539fda1023d7a95474028 SHA-1: 2b4c9e7d7e4dfd1cd786c97460f3e15c2365bc92 SHA-256: d933d14e8aa700fdcb3a2bf567d15713f93835f6358adb54e6d4e32353812029
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with SEO link farms and redirectors. The primary malicious URL identified is https://ttraff.ru/wb?keyword=tabla%20de%20conversiones%20de%20medidas%20de%20longitud%20pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting the document's purpose is to lure the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.ru/wb?keyword=tabla%20de%20conversiones%20de%20medidas%20de%20longitud%20pdf
    • http://kumaxuweg.liveinlovecs.com/uploads/1/3/0/7/130776031/3617953.pdf
    • http://files.deafdefy.org/uploads/1/3/2/6/132681210/runugevuvug_fowoxozogi_buxalimef.pdf
    • http://files.aroundtheboundary.com/uploads/1/3/2/6/132695194/ad5445dd8afc2.pdf
    • http://files.hooverdamnotes.com/uploads/1/3/0/7/130739146/6219677.pdf
    • http://tuxazara.zeenasopinion.com/uploads/1/3/0/9/130969926/2765323.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/xojuriv.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/plant_ecology_crawley.pdf
    • https://cdn.shopify.com/s/files/1/0435/7718/0328/files/skf_rolling_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4191/files/79292273561.pdf
    • https://cdn.shopify.com/s/files/1/0438/0445/9170/files/pikapofujap.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/najone.pdf
    • https://cdn.shopify.com/s/files/1/0437/6520/3093/files/mozamabisiwetid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/jubuzuxepi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/operations_management_heizer_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/27831220239.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/dowowabivumaxowutagadalak.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/25955870728.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_off0000613f.bin
8e0bdebc7f8f5dc66a254612d1c9e946b4bb3c9766794de249e3df9b32fe03d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 5624 bytes
font_01_sfnt_off00007448.bin
b40e6f80d76bb99063194adb87142faeb8e7999aa49c1c9d17a554ed6530a139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7448 11836 bytes

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