Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb47b0f5f604876…

MALICIOUS

PDF

52.6 KB Created: 2020-08-20 01:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 808405a87cbb98f313a6a2951d785337 SHA-1: 517fff805001d732026a46af4e4d5eaaf1a543af SHA-256: 5eb47b0f5f604876eea4531da1468d8aa342c69091418c57e4c809763f152659
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link redirects to a malicious domain, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for containing a mass external PDF 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.ru/pify?keyword=what+is+acrania+deformity+in+babies
    • http://files.elizabethelectricians.com/uploads/1/3/2/8/132814906/mixaxasijigomu.pdf
    • http://nuwel.citylimitshairstudio.com/uploads/1/3/1/6/131636725/kizitoxejakom_nififupovat.pdf
    • http://wizek.bikseriet.com/uploads/1/3/0/8/130813834/6700138.pdf
    • http://files.holychildcatholicschool.org/uploads/1/3/0/8/130814397/b72a99ee68b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/agile_software_development_with_scrum_ken_schwaber.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/mutaxadupetivogafewexig.pdf
    • https://cdn.shopify.com/s/files/1/0432/6670/3516/files/ny_dmv_forms_eye_exam.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2034/files/tiwigololaluvajukavagefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/fivexakeneg.pdf
    • https://cdn.shopify.com/s/files/1/0437/5835/4584/files/learn_json.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/bifelepolowutujimajaweto.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/20325245855.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2243/files/pajiwiworiraz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/mac_keyboard_shortcuts_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0450/7369/4872/files/xodeveruj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8787/2671/files/text_over_image_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/82927062599.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008db6.bin
620f8681eaafbcf8de2473b8ad004c78c4dd9027961a63fbaef449693dc4a670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB6 5484 bytes
font_01_sfnt_off0000a03c.bin
c66c0f3464788446478780886a90e2bc3c8085a3f619df133ff086a8362770b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03C 10712 bytes

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