Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4ed3a6685b6d9c…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 10:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 080b71ee6b275e72780f104be08b1eca SHA-1: fcce5e43096bbed2a43880b924ab87f801d0b365 SHA-256: da4ed3a6685b6d9cce3d936c983db90a3b861eb6afaedb02f255a7b68c5ccefb
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous links that lead to a redirector. The primary malicious URL identified is https://ttraff.me/wix?keyword=docx4j+vs+xdocreport. The document's structure and extensive use of external links suggest an attempt to lure users to malicious content, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the immediate payload.

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.me/wix?keyword=docx4j+vs+xdocreport
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/66654593034.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55781022724.pdf
    • https://cdn.shopify.com/s/files/1/0438/3001/8210/files/52645893146.pdf
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/ramiwurojetufa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0419/8044/files/10132590988.pdf
    • https://cdn.shopify.com/s/files/1/0431/9933/2516/files/musexezabegipe.pdf
    • https://cdn.shopify.com/s/files/1/0464/6495/8616/files/bacteriological_analytical_manual_fda.pdf
    • https://static.usrfiles.com/ugd/63d3ad_b9ddccefa69b4ded966e795dd6376530.pdf
    • https://static.usrfiles.com/ugd/d01287_de55cf45bd3c42bb999c22db0e85c5d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7649132ef5904122b1299c1e52f472a3.pdf
    • https://static.usrfiles.com/ugd/97634b_cd09cf92dbc1425381c5d4313b6cb6b3.pdf
    • https://static.usrfiles.com/ugd/5a1791_125bcc53bd9041ee96df114a55529343.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc7fd14f55584cf981a041432a1bc95e.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1982beb60f4633a0fc9de9b3d86fd8.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_off000062c7.bin
60c1b7cc7f11ec613b21ea4e594b9a503115b77a6a9b20630879eba7e74ec1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 5116 bytes
font_01_sfnt_off0000745b.bin
a95e2df94869ca418ec79d3c1bd30508d3cc0d6c041130845ca52a62c3ad5457
pdf-font-stream PDF embedded font (sfnt) at offset 0x745B 15156 bytes