Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3c5e94fc83c9eb…

MALICIOUS

PDF

69.9 KB Created: 2020-09-01 15:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77f7a29215084a435a3e0dfc97c7f30b SHA-1: 81d4041d6a1667d74637bfd46049e87e1da1d375 SHA-256: 0f3c5e94fc83c9eb2ac7091ed35e9a11d641157cf95ec6f352f692c382efdd0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://ttraff.cc/wix?keyword=bird+foot+delta+is+formed+by', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to external, potentially harmful, content.

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.cc/wix?keyword=bird+foot+delta+is+formed+by
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_86fd3b4a1b0e47df8cd87c2ef50731de.pdf
    • https://static.usrfiles.com/ugd/30e015_f2d98368125a4e32a1100744edb3faf0.pdf
    • https://static.usrfiles.com/ugd/0c4177_4e923c7aae3349f98e7e472edd49ad82.pdf
    • https://cdn.shopify.com/s/files/1/0437/7450/9213/files/99992429619.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2823/files/74911200651.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/91553628720.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevimija.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/gifudukobunopamuripotus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/beteti.pdf
    • https://static.usrfiles.com/ugd/6846fe_f5731c7c476e4bba93a15a8b85b187d3.pdf
    • https://static.usrfiles.com/ugd/cb2bed_9f1620c9a8244c54adb2851729b3e845.pdf
    • https://static.usrfiles.com/ugd/b8c837_269a0ae271c24819a837d7c986639da6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d463.bin
e93272b9c544b19900f859a6fa8f1b134f7c58d770546afbd3ca0ec65df7979b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 5344 bytes
font_01_sfnt_off0000e67f.bin
a3b6f0dfa608c9118462b28a5ddc32d4f6da388413a2180a72e7f8840e3c182f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 10604 bytes