Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f89eb5577aa3ce…

MALICIOUS

PDF

45.7 KB Created: 2020-08-22 15:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a05951a3b63cb09028e540f53164896e SHA-1: 789e44137226826d2a21cb75c90b506067924861 SHA-256: c4f89eb5577aa3ce673e9079473aac19a94fd4a43b91d0ac48226d2775384741
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely to appear legitimate. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL that triggers the redirector, suggesting a lure to a malicious site disguised as a 'chamonix ski guide book'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chamonix+ski+guide+book
    • http://files.bbsimon.com/uploads/1/3/2/6/132682570/tudijimavu.pdf
    • http://files.bandbac.net/uploads/1/3/0/7/130739084/3b8d959bf4.pdf
    • http://files.satxinspector.com/uploads/1/3/1/1/131163691/b8e7b.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/catecismo_de_la_iglesia_catolica.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1017/files/tinkers_construct_splinters.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/41640210688.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/rebedokinidojuvewizuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/black_sacrament_armor.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/laminated_snow_globe_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/29918869899.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/13378946016.pdf
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/present_perfect_affirmative_negative_interrogative_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0449/4124/6619/files/business_letter_format_cc_line.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/cemento_armato_precompresso.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/fegulumufozojumisipunas.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_off00007580.bin
0abd3b0e8a75991bd1d7825b9bb7d099ae84ddd3e885aaa2ff76aa5c7169cf67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7580 5288 bytes
font_01_sfnt_off0000875a.bin
fe2551b3fcf7d3fac003cae71a1ae6753e75a3bdf18e29df9ff2ce2bd23bb280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x875A 10144 bytes

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