Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb42738f81cb44c3…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 06:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e54962cb1a14ca10fbed212a8441cf SHA-1: 649c8d031979d88a82f92931ba8e7f3ce7d2fae3 SHA-256: fb42738f81cb44c32375f8fb6a79448ea03e303be22047777d8c2b1d2ccc0390
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.com/wix?keyword=romans+road+to+salvation+printable+kjv', which is flagged as a malicious redirector. The presence of numerous other PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning attempt to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=romans+road+to+salvation+printable+kjv
    • https://static.usrfiles.com/ugd/3aee12_6a137d3c7558430b8bbc954fc92113ea.pdf
    • https://static.usrfiles.com/ugd/6116da_597f468efe0e40e8bb487517ee8dbf6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfed0368144b4d54898b2bde364a1518.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/87507671339.pdf
    • https://cdn.shopify.com/s/files/1/0436/5480/7717/files/51963926685.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/voxajax.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/effective_communication_in_christian_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/fire_5th_generation.pdf
    • https://cdn.shopify.com/s/files/1/0443/2855/0556/files/mckinsey_approach_to_problem_solving.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7402/files/86681243974.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/install_memcached_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/0772/8023/files/origin_of_atmosphere.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/clciker_heros_hack.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.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_off00006415.bin
2519c24f73949ec5459c35057b6b068e83c7270ca642f65d47e587b18d201958
pdf-font-stream PDF embedded font (sfnt) at offset 0x6415 5452 bytes
font_01_sfnt_off0000768e.bin
e20e98985181fb01d2eaa4655665e72bf80e74c27ddcd792f018b8ef17645b5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x768E 10088 bytes