Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef1b8b5bc676d28…

MALICIOUS

PDF

45.3 KB Created: 2020-09-03 12:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2e3484e1488b0f5ee2b81f3f3b3d3f9 SHA-1: 0fa6cd0cc2096dde3f4ae18fbee32b083f4a3989 SHA-256: 5ef1b8b5bc676d285b6a1e76adefd1cc582c3d92a1e4f4333af1cb8d9b5657fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a search result for 'street fighter emulator pc', which redirects to a malicious URL. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL points to a phishing or malware distribution attempt.

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.me/pify?keyword=street+fighter+emulator++pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d2e4ea4c537e4aed807f9165405a8193.pdf
    • https://static.usrfiles.com/ugd/0dd040_88701da25a9b464795f6f172aa9d4e3e.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_74fffb36b37a41c0a3f237dba2aa3c1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2118bb7747e146ccbc5113a3c7f1e372.pdf
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/minecraft_1._14_chunk_loading_issues.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/hangman_java_solution_code.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/vonokopamovefizugutoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/subovoruset.pdf
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/72100217956.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/lobazerebuvepizuveji.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1565/files/apprendre_le_franais_dbutant_livre.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_739c9a8269f64358b5b215600eda4967.pdf
    • https://static.usrfiles.com/ugd/c1615c_8c89ef34cfec491c8c3a2d6e0620961f.pdf
    • https://static.usrfiles.com/ugd/8ba634_d596fd41811348679d35224ce179b1c5.pdf
    • https://static.usrfiles.com/ugd/26938b_de33558d6080412ab5730b658330bf7e.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f5.bin
8f30fb3b402aae3ce1d4d4b60b8fcab05283b363aef3f823f4e7658595347c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 4240 bytes
font_01_sfnt_off00006fd4.bin
b87786226b8adf4da49374940cd6515a49f2de4fe379182e2aa30e0584618b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD4 5352 bytes
font_02_sfnt_off000081e2.bin
b45b320cc12189565691f182859af34c4020c23c5ebc47419bfe3a3cbeca5f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E2 10928 bytes

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