Malicious PDF — malware analysis report

Static analysis result for SHA-256 4123d826b3dc64c2…

MALICIOUS

PDF

47.8 KB Created: 2020-08-19 06:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0756138c470a1e5fb836ae38dd837374 SHA-1: 45ab40606d35a2bee60e8e98fb443a96bc9cb884 SHA-256: 4123d826b3dc64c2cc4fa96ac4149bed48c9a74a0abb69c22d36bca6c5a8c1b9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, including a suspicious redirector URL (https://ttraff.cc/pify?keyword=guided+math+resources) and many links hosted on cdn.shopify.com, suggesting a coordinated effort to distribute malicious content through a large number of seemingly benign-looking PDF files.

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=guided+math+resources
    • http://kevamanew.mrshuffreadingisfun.com/uploads/1/3/1/4/131452958/luzaxoxinusa.pdf
    • http://files.nsanzineza.com/uploads/1/3/2/3/132303312/sovudedu-fafepa.pdf
    • http://vupiwexe.thedpgp.com/uploads/1/3/1/6/131637014/xarozujaxe_kudekopidol.pdf
    • http://files.nsanzineza.com/uploads/1/3/2/3/13230331
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/risenurebolikesuxerini.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4022/files/bizitudufozon.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/povupemuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2549/7239/files/cosmic_glue_strain.pdf
    • https://cdn.shopify.com/s/files/1/0439/4798/3006/files/15280335804.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/8949211094.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/php_explode_function.pdf
    • https://cdn.shopify.com/s/files/1/0450/2549/3150/files/california_vehicle_bill_of_sale_template_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0439/5833/7694/files/connecting_words_in_english_speaking.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/personal_finance_5th_edition_madura.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/english_alphabet_writing_in_four_lines.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4178/files/nuruzuzidadaxupesutujikam.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_off00007c46.bin
1f27acce7a136c8cc79fbc241a3a6f82b3de3106a01053b39e081d3b15d24403
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C46 5176 bytes
font_01_sfnt_off00008daf.bin
7ea6c5f2bac32654477181719a49b9834579e209925d2fdff3ba6a348ebba1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAF 10748 bytes