Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4521d36bdf7f79…

MALICIOUS

PDF

39.9 KB Created: 2020-08-20 20:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c92d2e24bbf896b855cffca8e31e32b3 SHA-1: 2bab2580a4b6d256ec318f11d7e03f17d00549bc SHA-256: fb4521d36bdf7f79ff1b42f99be98398fce15d44c3f6c580054e1b20c86249c8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic firing indicates a direct link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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=reporter+who+died+of+dvt
    • http://files.azvrha.com/uploads/1/3/1/4/131453268/5754771.pdf
    • http://files.futureprairie.com/uploads/1/3/1/4/131437725/porite.pdf
    • https://cdn.shopify.com/s/files/1/0428/8721/7311/files/70933634958.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/70606994978.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/inter_ethnic_conflict_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/repekelesalo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/the_devil_wears_prada_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/anatolian_languages.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/8916691747.pdf
    • https://cdn.shopify.com/s/files/1/0435/8399/6063/files/99085248924.pdf
    • https://cdn.shopify.com/s/files/1/0431/3340/3285/files/lds._org_leader_and_clerk_resources.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/39485939398.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1590/files/27438219399.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_off00005ff9.bin
2fbca8c9bc07652060d156b98d96df060194ca2e110e6be89a086dc2cf374af6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 4868 bytes
font_01_sfnt_off000070a2.bin
e01f35e6783b32b9091bb09ec1312b88caf43b25561310aa280b5c721fcc7718
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A2 10080 bytes