Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f540b6511b82446…

MALICIOUS

PDF

41.6 KB Created: 2020-08-27 19:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3154f08a29c9013c09e9e0e23d8c582d SHA-1: 0b03bbbfb9f5cbfce54e386b536aa5a08e69d347 SHA-256: 3f540b6511b82446b1cb34f852f3ab47a7c161122e2b19f9c973c0c8cd59240d
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous URLs that lead to external PDF files. One of these URLs, https://ttraff.com/pify?keyword=lista+de+espera+creditos+conyugales, is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text and a repetition of the malicious URL, suggesting an attempt to obscure the malicious intent or to manipulate search engine results.

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/pify?keyword=lista+de+espera+creditos+conyugales
    • http://lizevem.drscapp.ca/uploads/1/3/0/7/130776031/jedefuxa.pdf
    • http://files.72fire.com/uploads/1/3/2/6/132695874/7351952.pdf
    • http://rarumepu.unboundtravelers.org/uploads/1/3/1/4/131482975/mapiruguvidatalesebi.pdf
    • http://gujideb.andreanunesdmd.com/uploads/1/3/0/8/130814328/6069189.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/tutorial_blender_3d_bahasa_indonesia_lengkap.pdf
    • https://cdn.shopify.com/s/files/1/0428/4029/3543/files/functional_programming_in_scala.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/kelajase.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/case_580_backhoe_operators_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/luwenelozifesavonapafuvin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4493/7623/files/43383066968.pdf
    • https://cdn.shopify.com/s/files/1/0439/5024/3995/files/carson_mccullers_short_stories.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1871/files/58002922085.pdf
    • https://cdn.shopify.com/s/files/1/0437/2050/7546/files/zomezutuxuzudesu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/60532235699.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/kefovab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/ascended_master_discourses.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_off000061b8.bin
27fa7225793c1d5e2f46b379f034ad4de81e0e889ff01b6f3041ff84a217ef79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 5284 bytes
font_01_sfnt_off000073bd.bin
55b2d9da3f571184d9eed69a75d14c732ca8fcddf92c5c6b766d77ab0150944e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BD 11144 bytes

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