Malicious PDF — malware analysis report

Static analysis result for SHA-256 637be81f5c37ade7…

MALICIOUS

PDF

40.4 KB Created: 2020-08-08 22:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c938a20859035304f6da20236bdaae66 SHA-1: f0cd82f5b805620448385066d59ebbebf581bb87 SHA-256: 637be81f5c37ade780c948188d5838e16abc3def06407fb8d9b78be8fc691656
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, masquerading as academic resources, that redirect to a malicious URL. The primary malicious URL identified is https://ttraff.cc/pify?keyword=descriptive+writing+examples+gcse+pdf, which is likely used to distribute further malware or phishing content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings of a malicious redirector and link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=descriptive+writing+examples+gcse+pdf In PDF document text
    • http://files.latashahowell.com/uploads/1/3/1/0/131070246/kurulixe-safusuxewopubo.pdfIn PDF document text
    • http://files.pitabilities.com/uploads/1/3/0/9/130969313/5206329.pdfIn PDF document text
    • http://files.havenorphotography.com/uploads/1/3/1/6/131606027/poratomikipezij_zipevefusirale_rijekonanaw_juvonur.pdfIn PDF document text
    • http://files.sophisticatedstyles.net/uploads/1/3/1/4/131407802/1747584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9914/3838/files/sotejanil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/25615802685.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4782/1205/files/64648810836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7357/6865/files/tametanexavawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/generative_adversarial_networks_with_python_jason_brownlee.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/tofixaleduropopiminelixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8472/5926/files/guzuzevoxofewerozazupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/68137099644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/77026226685.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8634/8450/files/5607009825.pdfIn PDF document text
    • https://filestore.aqa.org.uk/sample-papers-and-mark-sIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eaf.bin
5805a256cb39c011d16b07669dd8088db445c6788afd2070586ef7bbf8ae0188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAF 5692 bytes
font_01_sfnt_off00007219.bin
38b32e957cfc2f36b33be86cdbd593413f1530cf141c2db30e33270573622534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7219 10204 bytes

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