Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a39be97c7ba0356…

MALICIOUS

PDF

44.0 KB Created: 2020-09-02 21:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a42ed9cd2ddd73721d86c0c7df6772c0 SHA-1: d84804b843792305c51a205e3a99f000f35ffd06 SHA-256: 4a39be97c7ba0356ffd5ba72e1ea0f108eae763d779af8b96afcfe1a74763df3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that mimics a search result for a popular app. The document body, though heavily obfuscated, contains this same URL and other links that appear to be part of a link farm designed to improve SEO for malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=facebook+messenger+apk+latest+version+uptodown
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/stop_google_sign_in_request_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/9003/2278/files/praise_and_worship_scriptures_in_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0448/9605/9547/files/buchholz_relay_function.pdf
    • https://static.usrfiles.com/ugd/fc840b_30c3c5d2983a4b6288987aa834638ae7.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_052a40f232f841b382ca47c11ce46720.pdf
    • https://static.usrfiles.com/ugd/9d869b_ee14e8cd41e64d97acfe2e0e2b810e47.pdf
    • https://static.usrfiles.com/ugd/843280_f19aab540ede4103a81fcc157106d16c.pdf
    • https://static.usrfiles.com/ugd/c1c462_725b4cb49a9b4e46b4e6ecf4f5713453.pdf
    • https://static.usrfiles.com/ugd/74c34a_bfef95a756f8457f98c4ad6e366a0fa0.pdf
    • https://static.usrfiles.com/ugd/8cbfce_ca0f63fa72a0407495930cb659621e19.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/passive_voice_modal_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/animal_word_search_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/upsc_csat_paper_2017_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0463/5715/1905/files/bootstrap_4_table_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/62507458031.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_off00006c37.bin
dd8229c6400c03e267ef7d9a3f14cbb0609ba05c47ab3222cb009d37e061f40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 5704 bytes
font_01_sfnt_off00007f9b.bin
d714dfb5101bcc4c724fdc123d1ed6a381a938f9317a766f22c1c2c7709ad037		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9B 10484 bytes

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