Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed4a785be0f1df4…

MALICIOUS

PDF

37.9 KB Created: 2020-08-20 02:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3840bc2d4d7c313c8b870554655bcab SHA-1: 3dfb2d5bdf4a23207e311d2e0884db39d114ca28 SHA-256: 4ed4a785be0f1df4032b4c28c91c88cb0e2cc4be87f71204f169e2bf24e80b5f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. This suggests a phishing or social engineering attempt to lure the user to malicious infrastructure. The document body, though heavily corrupted, contains text related to 'sentence structure worksheets 4th grade pdf', likely a lure to disguise the malicious intent. 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.com/pify?keyword=sentence+structure+worksheets+4th+grade+pdf
    • http://files.julesburgmennonitechurch.com/uploads/1/3/1/3/131398334/fekububo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3077/files/badminton_rules_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zonamanasalusowalu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/6365647770.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/konica_206_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sutapazuvonovojikujabera.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8768/files/translate_french_to_english_document.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/vurivarume.pdf
    • https://cdn.shopify.com/s/files/1/0451/7521/0133/files/most_secure_android_browser_2019.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_off000054a4.bin
bb1ec4915182508f3112e6ebfc8ec6546ee53ed4e1e107c9f39fa8c5bfe7b0c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A4 5732 bytes
font_01_sfnt_off0000683c.bin
727bb64a48ac1ce9f10b66417029c8a016267e1d414c1f52d28bc7e9b33f7d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683C 10216 bytes

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