Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3e367b6b10049c…

MALICIOUS

PDF

35.6 KB Created: 2020-08-30 15:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e0ea68ba15a75cab5ba68250d7bc68 SHA-1: 902df69ceb429ef486af497ca6e2a310f4a2e822 SHA-256: bc3e367b6b10049ce04b0d023e77344ba38f244d01f915acef15b185f587a324
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm.

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.ru/wix?keyword=taco+bell+chicken+quesadilla+nutrition
    • https://static.usrfiles.com/ugd/e33828_eeefa6ec57684f81832bf240139f4582.pdf
    • https://static.usrfiles.com/ugd/c836c3_a9fc839b222a4b2a8ecb2c349601027d.pdf
    • https://static.usrfiles.com/ugd/804ff6_ded916c4ec8e42e3a8f89092b7495e5d.pdf
    • https://static.usrfiles.com/ugd/e2c250_40b511b666c54b1e8f1a4ed6abb74db7.pdf
    • https://static.usrfiles.com/ugd/79e5df_da505fecd2e14d23b77d14d4ef0cff58.pdf
    • https://static.usrfiles.com/ugd/48f461_78e9671fe08e4f5f99681d231033c349.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b50bcbcf018438aa93353c7cc087134.pdf
    • https://static.usrfiles.com/ugd/b8c837_264356d6f05d451283bbbca91f837450.pdf
    • https://static.usrfiles.com/ugd/8b4172_38eea6d62c4740de818714eda2080b27.pdf
    • https://static.usrfiles.com/ugd/b8c837_e022dddd4185465698943bf8c13a8487.pdf
    • https://static.usrfiles.com/ugd/f1780b_cbd0d4b0d45e4766972ad457b1625475.pdf
    • https://static.usrfiles.com/ugd/b8c837_b33e644d46cb465c9b02b6d1cc491979.pdf
    • https://static.usrfiles.com/ugd/b8c837_91b65c4aed5c49e0b53f8eb71402cae4.pdf
    • https://static.usrfiles.com/ugd/6cf392_ecf919eb1c034f71b8055f9af4bc6a9e.pdf
    • https://cdn.shopify.com/s/files/1/0432/7214/3001/files/atomised_book.pdf
    • https://cdn.shopify.com/s/files/1/0464/7511/6694/files/10408124923.pdf
    • https://cdn.shopify.com/s/files/1/0435/9215/5295/files/construction_progress_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/2827/3562/files/securecrt_7._3_full.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_off00004d4f.bin
fc9379e147f6648de671aeb54545c665efcee4038a95687eba533402ec0f85e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4F 5308 bytes
font_01_sfnt_off00005f3b.bin
0544c4e758ec4231260270dea06af679f148a10a05ba932b6594722068eb5383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 10148 bytes

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