Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e2ae91143a1b9b…

MALICIOUS

PDF

33.9 KB Created: 2020-08-29 05:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef400de457dc364dd3995b25909793e0 SHA-1: 59cf473a83dde939b023e945e9de2fb83067f60d SHA-256: c2e2ae91143a1b9bba325183dfb580861f24374d0556a4fd2ddb7797d66c2909
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with numerous external PDF links hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or the distribution of further malicious content via a link farm.

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.cc/wix?keyword=life+span+human+development+9th+edit
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/duginakuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5846/files/30059966835.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/alimentos_antioxidantes_naturales.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d26fefe41eb4389beecdda60ea2ff8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_34b50b827e3f437b9d9bbf6ab7b54bb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_718bb31baaeb4d43b6c8e52a6d7fb111.pdf
    • https://static.usrfiles.com/ugd/b8c837_854749b94cf34baca9ab932ae6fd90a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a12b8c2a6b14c78b162a8183953af0f.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/rofulijili.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/70218405892.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/37770195520.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/bonfire_of_the_vanities_book.pdf
    • https://cdn.shopify.com/s/files/1/0457/6765/5580/files/descargar_el_diario_de_bridget_jones_2_por_utorrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/wozise.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_off00004603.bin
7248da6dce7c23502245e61af7cab748f62bfccc2b8a4b07d44d893e6e5094f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4603 5344 bytes
font_01_sfnt_off00005813.bin
8ffcc403c3b222e30bbed302925e8812cc60fe507d29f1c67bc9e994897223e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5813 10220 bytes