Malicious PDF — malware analysis report

Static analysis result for SHA-256 487f38eb2e5c3140…

MALICIOUS

PDF

35.9 KB Created: 2020-08-30 18:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2e4f22cb99195e58b5a19aad13d7033 SHA-1: 8212923650bbd56ae4e39035490a6bf572d0cda0 SHA-256: 487f38eb2e5c31401c37cc1e1c9153c468ff747ebb0198bb132f032480121d54
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=assembly+language+step+by+step+2nd+e'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and a document title related to 'assembly language step by step 2nd e', suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=assembly+language+step+by+step+2nd+e
    • https://static.usrfiles.com/ugd/daca0d_71c8b8a180e8425e8542cdaa6d135621.pdf
    • https://static.usrfiles.com/ugd/b8c837_10d67812611b4847826248b5193855b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_40fac45572904770b6423b61e4f8c578.pdf
    • https://static.usrfiles.com/ugd/b8c837_c76a66380c9f4b50990411721f5d42fe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/aesseal_plc_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/26880675166.pdf
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/xijekepevirov.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/59155851387.pdf
    • https://cdn.shopify.com/s/files/1/0430/7694/4021/files/job_cost_sheet_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/appendices_in_internship_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1111/files/john_deere_l100_parts_manual.pdf
    • https://static.usrfiles.com/ugd/aef5b7_0248e89b1c9e42a187ff8ac0ca6ba232.pdf
    • https://static.usrfiles.com/ugd/ca32a8_89201befed124af0af6b8e3e2d68449e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddb5693a4e1948ef990733007f7e0f32.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef21ab562a21423da427b2b5f7edfb67.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3c08653dbf460793325522e1576ce8.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_off00004d37.bin
9b74e6672e2a34804f54d97160ed5352a25018071bd103c70ec9feb89912ca17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D37 5548 bytes
font_01_sfnt_off00006002.bin
dd417f9bc20c3813293dbdb56604d92a79f25392cf5cf2f9ee7d45324c71726f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6002 10160 bytes

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