Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa97eb7c400a0c4…

MALICIOUS

PDF

41.4 KB Created: 2020-08-24 05:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9994f561db11757aa61e82d3ff228514 SHA-1: 0240b4a9938442d05caef9a69a7eb1e11757ca13 SHA-256: cfa97eb7c400a0c41221620a68fbe8fa777a6626f266eae12bea2112467d6559
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a lure to a malicious site. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS heuristics strongly indicates malicious intent.

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=compare+two+excel+worksheets+for+duplicates
    • http://files.reverierosedesigns.com/uploads/1/3/2/7/132710671/suduvebowodonupufi.pdf
    • http://zezovu.wsori.org/uploads/1/3/1/6/131636655/a36358a7a5754.pdf
    • http://files.beercityrecovery.com/uploads/1/3/0/8/130814258/vovew-telifoj-zopupovikef-kipope.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/formal_email_writing_examples_with_attachment.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/discovering_behavioral_neuroscience_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/road_rash_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0449/6615/0303/files/axis_cube_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0437/9924/9058/files/vovalumarukinunakar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1801/7175/files/9050876062.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/crossfit_bodyweight_workout.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/85077557792.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/ashrae_2020_fundamentals_handbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/20963409581.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/how_to_uninstall_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/21426749714.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_off00006467.bin
0bfe535cd0b722d33aec1a1fde73eabf7dc75aaf5ae201d6efdd1db8250ff79c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6467 5524 bytes
font_01_sfnt_off00007714.bin
ff0859254b07da698f591c41bac46d30fdd2d907aa4f12340e08846079a2de23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 9800 bytes

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