Malicious PDF — malware analysis report

Static analysis result for SHA-256 12523383ce5a0292…

MALICIOUS

PDF

35.5 KB Created: 2020-09-17 13:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3abad56e9b75c97b6285e6f79fd0c6b0 SHA-1: 3c49e1a0e74861fc367bdd236c033345dd3d683f SHA-256: 12523383ce5a0292132db4712d095e9118db346e6179ef465496feec8d484315
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=dremel+saw+edge+guide'. It also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, but the primary redirector is suspicious. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link suggest an attempt to lure the user to a malicious site, likely as a spearphishing attachment.

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.club/wix?keyword=dremel+saw+edge+guide
    • http://karedik.resilientpeople.ca/uploads/1/3/1/4/131454215/fafab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3398/4161/files/glencoe_algebra_1_practice_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/zibixefenowodaripizik.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/gizimazipudabeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/75790682844.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/59405465250.pdf
    • https://6820e32c-6ea2-4ec5-b82d-05e08fc26f5d.filesusr.com/ugd/6f9b04_2de977321e8d4a339d0bb49072c63052.pdf?index=true
    • https://d522d129-e086-4835-ac60-b2d349472a0f.filesusr.com/ugd/7f614e_4d9064197b594df790084558ab66b88c.pdf?index=true
    • https://eda2654f-f331-4251-8eb0-a5f41eb15e7e.filesusr.com/ugd/154db6_d4a23dd5f39e43c39d2b2fa05dec8a5a.pdf?index=true
    • https://9d82a3a1-1f5f-4126-ad8a-405b4f9c2da5.filesusr.com/ugd/45fd81_3f3cf3e610754aa3820bf962e8502564.pdf?index=true
    • https://9323ed79-26c5-4fa9-868e-96a228348d78.filesusr.com/ugd/b7ab08_4c76e960b54f40b2a896991990b27c84.pdf?index=true
    • https://24c75495-40af-450d-b4b1-ece5a69891db.filesusr.com/ugd/ea2f88_bc6f3783f18f409fa1a8bef09b5ede87.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e38.bin
36f64cc91ab66dd8bb486c01e5c035e2f727bdcfd914590c14e105df3e3b6360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E38 5236 bytes
font_01_sfnt_off00006002.bin
66dd7c74c3d0861a4995b28c50ad88356852f9d69d871f8e9d40d5b41791b396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6002 9904 bytes

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