Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d5b9647121a99e…

MALICIOUS

PDF

44.0 KB Created: 2020-09-08 11:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad0b28b47ad5106f212158190c10f82 SHA-1: 343c4914844580b923d953b41f9eec613e4edc69 SHA-256: c7d5b9647121a99e2aa78c99cbac680befb9f760c349791e4ed50388a4a36505
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=besties+meme+template'. Additionally, another critical heuristic indicates a PDF link farm with numerous external links, suggesting an attempt to obscure the true destination or engage in SEO abuse for malicious purposes. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

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=besties+meme+template
    • https://static.usrfiles.com/ugd/d2751c_cdc99c1f44644f1cad36a9d38231e5fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f09115c31ba43d1998f27242f01d6c4.pdf
    • https://static.usrfiles.com/ugd/defcb2_8ae58b39bb9b45da961433663b1f5ce0.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/detroit_lions_injury_report_for_week_6.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/59890695960.pdf
    • https://cdn.shopify.com/s/files/1/0468/0315/7141/files/pancreatic_cyst_guidelines_radiology.pdf
    • https://cdn.shopify.com/s/files/1/0437/6608/7838/files/inception_report_en_francais.pdf
    • https://static.usrfiles.com/ugd/9bd82e_68b38388acd141578120fc0e350653b9.pdf
    • https://static.usrfiles.com/ugd/bfd78a_1f8516182b8c4ae39c379af66138c5a3.pdf
    • https://static.usrfiles.com/ugd/756799_dd841bc2fd7f4e9583457f7604c8e0e2.pdf
    • https://static.usrfiles.com/ugd/120f26_c5f653990e56440a814cc513f2fdc9d1.pdf
    • https://static.usrfiles.com/ugd/158fb9_c92b60fe119d4516bdc66def70505d8a.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_off00007023.bin
84db70d8e659b805d671358e3e6789d9ef945e7e1afc9d3c8dd4097602b33d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7023 4916 bytes
font_01_sfnt_off000080c8.bin
1ff321a4ae811aca20d1dc2b338b65be9ee7454f44004233df7848a7af65bae8
pdf-font-stream PDF embedded font (sfnt) at offset 0x80C8 10248 bytes