Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc536a19fb4e6236…

MALICIOUS

PDF

45.7 KB Created: 2020-09-19 16:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f4e6bee520b7a263473ef19275e8750d SHA-1: b52fb36382321d5af45f181a6c47200528cf24db SHA-256: bc536a19fb4e6236815bd45f0a64dcc54cff894afa753597efedfc1271313d63
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for specific PDF content. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports a phishing or redirection attack pattern.

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=pathfinder+lost+omens+world+guide+pdf In PDF document text
    • http://lusujoko.coordinatedentry.com/uploads/1/3/1/4/131452836/a5d54994dc.pdfIn PDF document text
    • http://files.issl.space/uploads/1/3/0/7/130738700/7d4db367e38.pdfIn PDF document text
    • http://xebajaj.cbfieldstation.org/uploads/1/3/2/7/132740405/nuwewugitejejilim.pdfIn PDF document text
    • http://dolote.brockenhurst-station-taxis.com/uploads/1/3/1/8/131857120/lavabuguxut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c457e500-1321-4d8c-ba13-41100bea6278.filesusr.com/ugd/4e6dd5_e23022aa897444cfbdb207ddd8a2fd02.pdf?index=trueIn PDF document text
    • https://21e4471c-a8b2-41d0-ad4a-dae23969143c.filesusr.com/ugd/370ea2_b9dbcc7f46c54709a2fa206cbd2d314b.pdf?index=trueIn PDF document text
    • https://9b2189bb-1969-4ff9-a4b4-9b0c6ecb4fa4.filesusr.com/ugd/a13bc2_4d57deed9bfe450f93b9103b51936abb.pdf?index=trueIn PDF document text
    • https://cfe800c2-3d6a-4c79-be9a-e5ed8a3e2af2.filesusr.com/ugd/ebc5f9_0cec423e9366445699e0792ac86204bc.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/kuwumi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/38559365441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/nupupimapebijopujozozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/rijag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/58796728131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/81594328001.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/rawetiwanavajatujodudin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/2246414627.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B1 5432 bytes
SHA-256: 654bf29e9b303abe5d389e13055cac0fce97fede8502c163564f325a39131b65
font_01_sfnt_off00007805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7805 10432 bytes
SHA-256: 37c0c705d4c96b69c62afe72c5e452aa85f1c9c06806af5b732f588a223a4530
font_02_sfnt_off00009bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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