Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd765a7941d17d7…

MALICIOUS

PDF

45.8 KB Created: 2020-09-05 09:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a4bddc1329db84c1f2fe9393f7ce80 SHA-1: 7a340705b1aa066ce0179de13cdbfec903a34e39 SHA-256: ecd765a7941d17d7d8d66f2b6badaf49e2dc9433e3ffc65c73e42e00f5211428
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=web+of+science+journal+citation+reports+2016', which is flagged as malicious. This suggests the PDF's primary purpose is to redirect users to a harmful site, likely for phishing or malware distribution. The presence of numerous other links, many pointing to static.usrfiles.com, further supports the 'link farm' heuristic.

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.link/wix?keyword=web+of+science+journal+citation+reports+2016
    • https://static.usrfiles.com/ugd/6da380_4da06e52427d48268c2cb0b5fa595838.pdf
    • https://static.usrfiles.com/ugd/b8c837_84ffaf7a36a94757a98a5ce6466eac04.pdf
    • https://static.usrfiles.com/ugd/ecec20_9bc4fb5001654ed7ad5d1e1e77f03d74.pdf
    • https://static.usrfiles.com/ugd/b8c837_b291d8e5287540a7a20338fd5a39b0c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_461927c5a3114e60b93e5540d402a421.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2886/files/sql_query_interview_questions_for_experienced_professionals.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/don_t_forget_your_old_shipmate.pdf
    • https://cdn.shopify.com/s/files/1/0431/9703/8756/files/duvusabebix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/37305805828.pdf
    • https://static.usrfiles.com/ugd/314c35_7014328297b342d69f881975bb342bb4.pdf
    • https://static.usrfiles.com/ugd/6f7357_d63834dd54a947cb93c19d4c2debd24a.pdf
    • https://static.usrfiles.com/ugd/e2c250_e2d6ae1388ab48f7a07ce669e5764be1.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/mmpi2_online_test.pdf
    • https://cdn.shopify.com/s/files/1/0465/5310/4542/files/lewedulodoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9540/9311/files/90835526283.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/jimob.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_off0000694c.bin
ae54684d9d63324164bb73aeaf00137a6f0d2654c80a754746f1f82524e5f84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694C 5716 bytes
font_01_sfnt_off00007cef.bin
8cd4db8b1e457f057abda45dc41e19179783ed03c58d285809cd118dc943a00c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEF 13820 bytes

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