Malicious PDF — malware analysis report

Static analysis result for SHA-256 350342dbc4b83fa1…

MALICIOUS

PDF

56.3 KB Created: 2020-08-31 17:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e743287ae1986e05d6ab5c2a7b9691a7 SHA-1: 10c9d2f1a62f3b6c4dc2fcc93a46421d318a52b8 SHA-256: 350342dbc4b83fa13582c05bd8d5f08f5aacd75736e7a1ddb480353a1c0cbd6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a significant number of external links, identified as a link farm, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. This suggests the primary purpose is to lure users to malicious sites. No scripts were extracted, limiting the analysis of specific execution chains.

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=metal+platform+bed+frame+vs+box+spring
    • https://static.usrfiles.com/ugd/b8c837_29d012bf2c4844658994e1a5db8f2014.pdf
    • https://static.usrfiles.com/ugd/5bb01c_06d496357a844c93891771b0936c5ebe.pdf
    • https://static.usrfiles.com/ugd/99afdc_622673dc4d874c178b6900c8fb42bb14.pdf
    • https://static.usrfiles.com/ugd/b6edda_47e8bbd527984ecda091404510892758.pdf
    • https://static.usrfiles.com/ugd/de60da_84d1e4bcbbcc4cc89dd0157f5eff28c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_70961a14e05f4d12a2d9443d7faf2da3.pdf
    • https://static.usrfiles.com/ugd/911c12_36174e89ea8d4719b00fc2ee42c1b39a.pdf
    • https://static.usrfiles.com/ugd/2f7815_8340bb5e4be541609f3e6df9e38ee9d6.pdf
    • https://static.usrfiles.com/ugd/5de1df_431d67e581ec44848d1b2e01284a5b29.pdf
    • https://static.usrfiles.com/ugd/f1d680_7b0245ae68c648959e945f2f7b000f61.pdf
    • https://static.usrfiles.com/ugd/5438e3_621f28bcfd8c4b3faa71bc9f9109f8ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_a409acdc255f47debc86f2cbc47a36cb.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9001/files/allahabad_high_court_aro_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0432/7614/0710/files/uber_eats_business_model.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/computer_science_with_python_-_cbse_xi_textbook_for_cbse_class_11.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_off00009bd1.bin
29f837dde1a409f9c58023144dd74f33c42f02b712bc5d63ff4c1bc1ff715f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD1 5636 bytes
font_01_sfnt_off0000aefd.bin
b0a17a003fa093a852e783dbb08f1d1c606300e498893b5b0dbebd4587896792
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFD 10832 bytes