Malicious PDF — malware analysis report

Static analysis result for SHA-256 599093d1eb41b7a2…

MALICIOUS

PDF

56.7 KB Created: 2020-08-31 04:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db4fa21322fc9fe9c07383ea30f0ce31 SHA-1: 9684bf0e2d54c4a60e5221343c8b302b96794810 SHA-256: 599093d1eb41b7a2f8b297e5028324c9508bb80b9c2cc5eaa281b4a3e309c7db
152 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/wix?keyword=relleno+sanitario+ventajas+y+desventajas'. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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/wix?keyword=relleno+sanitario+ventajas+y+desventajas
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/kutudajuvamefapefad.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/5804463038.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/gineberimepaliriwuxaliv.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa7348c0ba49440286388a7f8114c242.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae5f3e1cbf8447b7ab0616285f8b1dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_e36b7e4a920346da937485d9921a63db.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c93cdf559994137aac924232026cf28.pdf
    • https://static.usrfiles.com/ugd/b444d4_715576e18b244349b3d036705e66d233.pdf
    • https://static.usrfiles.com/ugd/5b9a87_f83cdd0569934e8fa9c3aa5e87681e2d.pdf
    • https://static.usrfiles.com/ugd/23e9be_e242848050254606980e468b27d558f2.pdf
    • https://static.usrfiles.com/ugd/234f58_f6607e8eb9d04bcaa835bc8942ce7e63.pdf
    • https://static.usrfiles.com/ugd/54fa57_6c8650028ccf44009c886e876506ff3a.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/kafenekam.pdf
    • https://cdn.shopify.com/s/files/1/0436/6663/6953/files/67867191480.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/balance_sheet_classification_interest_revenue.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_off00009e4c.bin
9425bb7494787304c99933f1b9ed81037fae3d706018beb8797a8d89b550240e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4C 5064 bytes
font_01_sfnt_off0000afa6.bin
8778f0ee0afe67f6fe16dd846893604758dae1845e4751f6d9e3507be7993d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA6 11320 bytes