Malicious PDF — malware analysis report

Static analysis result for SHA-256 3138bad24ad837dc…

MALICIOUS

PDF

41.6 KB Created: 2020-08-21 01:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc52fb58576becd1cc88d5d83d6e9c8 SHA-1: 5169dbbecb3dafeaf5be86b9e7b48ed87c3a8dea SHA-256: 3138bad24ad837dc6364653f94e5257631b5af56debc2362176f0d06c95cce96
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link to a known malicious redirector. The document body, though obfuscated, contains the text "Expanded form worksheet grade 2" and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=expanded+form+worksheet+grade+2
    • http://files.detailap.com/uploads/1/3/0/9/130969811/7509537.pdf
    • http://files.erikaschool.com/uploads/1/3/1/4/131406430/babezakivid.pdf
    • http://neletevuf.grovebaptist.org/uploads/1/3/2/7/132740623/e2f5a63.pdf
    • http://wexakefu.oceanpinesplayers.com/uploads/1/3/0/7/130776644/70443de25e.pdf
    • https://cdn.shopify.com/s/files/1/0440/0257/4494/files/932271293.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3281/files/craftsman_gt_5000.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/difaxilezidaxulunik.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/loraine_boettner_catolicismo_romano.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/arpeggios_rhythms_and_scales.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/bwwm_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/82591942041.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6980/files/cdc_immunization_schedule_2015.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/figome.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/
    • https://cdn.shopify.com/s/files/1/0431/5830/6

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ba.bin
522938b5df9c3345a7ad6ca8b3c9f8752536f84a5ab401b90270f7f560b07890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BA 5736 bytes
font_01_sfnt_off0000773d.bin
b18c7bb28bf9db7dacfae6b37460b297f60233525c33a4bfc782a83795342aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 10028 bytes

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