Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1d247d6167875…

MALICIOUS

PDF

47.2 KB Created: 2020-08-15 02:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edd9c651ac812a9a17e6e5ff94c679f9 SHA-1: 95795d3b2ac2443ca16b936ec6748d6210440a72 SHA-256: 85c1d247d6167875000945b93f9fcdd5c9e6ca199f0fe73a29359cce5f78f82d
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains embedded URLs that are also present in the extracted URL list. The presence of a 'download button' lure and the ML classifier's high confidence further support a malicious intent. The document appears to be a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=adansonia+digitata+medicinal+uses+pdf
    • http://files.alphaphiomega-betatheta.com/uploads/1/3/1/3/131398010/5311409.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/boniwexusuxatavumaduwov.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/9637260930.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/49481632595.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/94993420668.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/assumptions_of_law_of_demand.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/95428655221.pdf
    • https://cdn.shopify.com/s/files/1/0445/4852/2143/files/16702095227.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/ascites_approach.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/power_amplifier_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/93465028975.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_off0000796d.bin
33b5bee666d56620f439200aba320812a00f995fd303dc59b15ff561724b5dff
pdf-font-stream PDF embedded font (sfnt) at offset 0x796D 5368 bytes
font_01_sfnt_off00008ba9.bin
9e92a8ef63a0b04ddb0b63b5db31f11799c4e3a8b7e27d27b1d1a2a0a554b81d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA9 11256 bytes