Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe9404d199cd00c…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 07:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15eb45002b08f9443a5ed78284de0bbb SHA-1: a086da94754ec6ae9f807bff8cedac3694b54614 SHA-256: 2fe9404d199cd00c103dc4b1f5ae1e77355b43988e48db28e50a8ae8bfbf15a9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wix?keyword=trinomio+de+la+forma+ax2+bx+c+ejerci, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or heavily encoded, but the presence of the malicious URL is sufficient to determine the attack pattern.

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=trinomio+de+la+forma+ax2+bx+c+ejerci
    • https://cdn.shopify
    • https://static.usrfiles.com/ugd/a640e9_f8ea41c8e41748e481d3399d4cd16258.pdf
    • https://static.usrfiles.com/ugd/b8c837_58920cc15e0a48b4b9f9f191845df1f3.pdf
    • https://static.usrfiles.com/ugd/b444d4_43b4d6d9eaad4e27af9232591b6f52e2.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_a107ce2193984e25b15f870012e4e433.pdf
    • https://cdn.shopify.com/s/files/1/0438/9303/1080/files/68224113111.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/symbolab_pro_apk_hack.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/fafinozogelujotes.pdf
    • https://cdn.shopify.com/s/files/1/0437/7555/7793/files/pubaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65925238695.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/salesforce_developer_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9373/6089/files/diploma_di_laurea.pdf
    • https://cdn.shopify.com/s/files/1/0456/8852/0863/files/16009731089.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/jakuzixinobugave.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7900/files/lasowoninipizetopotu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/nusav.pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/wuwidowiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b86.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B86 6440 bytes
font_01_sfnt_off00006b7a.bin
49f11b5df55ff7204ca31ad22769ab620ccac70ee123b4c6c1d56d8e69e5fc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 5352 bytes
font_02_sfnt_off00007d9d.bin
63ed72cad4d627e8dee7c878603eaff51a5b491a93cefeaf64abb339c182f81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9D 10476 bytes

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