Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3285202e2f4a54…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 04:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d7e4f7ddf746c6bfd7feaae6862022 SHA-1: 9c6756f0fe0fdd6a515acdc780da17637ee4b900 SHA-256: aa3285202e2f4a54f33da7fe1d7cbbfb09c6040c9e60b291e1ab00ca8500baf1
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The primary malicious URL identified is 'https://ttraff.com/wix?keyword=el+ejercito+de+ceniza+jose+pablo+fei'. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent.

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=el+ejercito+de+ceniza+jose+pablo+fei
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/dijidininekebalexag.pdf
    • https://cdn.shopify.com/s/files/1/0441/0982/4152/files/lebakamuxubukanu.pdf
    • https://cdn.shopify.com/s/files/1/0464/5647/1720/files/59002176444.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/favitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5284/files/lubabetiwajofogav.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/fulibawisagixerog.pdf
    • https://cdn.shopify.com/s/files/1/0435/1400/3610/files/florida_topographic_map.pdf
    • https://static.usrfiles.com/ugd/83e24f_a4c8e17c204f4d578b858f96f09264cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2cdf11cf77d41e495478a8651f93925.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae99941970e0485da10f56d4a04bda7d.pdf
    • https://static.usrfiles.com/ugd/63d3ad_087fa3457013427ebac3cd09dce3e543.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_b9980886d3fa4c27a926c608bba2ad19.pdf
    • https://static.usrfiles.com/ugd/4725f1_4f53e8a269c0467ca00de746eb6785d9.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_8e1c526ad7654c16b2d80eb7fec2f148.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_off000071e6.bin
38333d99b28b4cdae28f8e876c5cef384b6a3998a16182860d3190ffdb4be167
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E6 5372 bytes
font_01_sfnt_off00008439.bin
6931aec110b65e0adc411592ce20eb2cd0ee9c358df516f95c5e05541615b76b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8439 11236 bytes