Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f256815aa17142b…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 23:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73810ff5cd4043321043b17bfbea7299 SHA-1: 83df33b05fd800e8ba326e5b18c6e616aff4ba48 SHA-256: 5f256815aa17142bdf6afb0f6d2e3d43c1fa62ac2adecbdbf8afc4b25a9bcf65
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL and appears to be part of an SEO spam or phishing campaign designed to drive traffic to malicious sites. The ML classifier strongly supports the malicious verdict.

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=il+mulino+di+amleto+libro+pdf
    • http://files.cyberzone.ca/uploads/1/3/1/4/131408432/lanazimosune-danejoxi-vunumilujugaxaf-fagop.pdf
    • http://regon.timbertowncoffee.com/uploads/1/3/1/6/131637814/6c046836da2e2.pdf
    • http://files.snowyrangeleather.com/uploads/1/3/1/4/131454316/7476e457367.pdf
    • http://files.simplyelicia.com/uploads/1/3/1/8/131858916/56387.pdf
    • http://rasufo.dayafoundation.org/uploads/1/3/0/7/130776485/maxitemagesufe_tuwapunikofemet_vetujapega.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/76884772022.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6581/files/72288464012.pdf
    • https://cdn.shopify.com/s/files/1/0432/2869/2643/files/36643877262.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/pdf_not_printing_no_pages_selected.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/59968237915.pdf
    • https://cdn.shopify.com/s/files/1/0430/2975/8103/files/fixevugupodiwu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6552/files/witurarabaxikoval.pdf
    • https://cdn.shopify.com/s/files/1/0434/5852/7394/files/rosipedilamumebemekonane.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/41500177160.pdf
    • https://cdn.shopify.com/s/files/1/0428/8810/2051/files/factory_reset_nintendo_switch.pdf
    • https://cdn.shopify.com/s/files/1/0430/8870/7733/files/50763048867.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/12178754428.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_off0000733b.bin
e94f8f20469b689d46c1bd80c935a6b3e205c75d14d9f13bcfe2dced486c9fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733B 5088 bytes
font_01_sfnt_off0000845f.bin
258fc8b828f267e6a67e903b83f3bcc193d179c89ac9f3617226a1c6ce7403da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845F 11160 bytes

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