Malicious PDF — malware analysis report

Static analysis result for SHA-256 1375b4774a960478…

MALICIOUS

PDF

40.9 KB Created: 2020-08-22 05:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5825240ca3cf6c16b0c7af61eff4e309 SHA-1: 27f6f6fecf756ca76b6572928da0ff799abfe77a SHA-256: 1375b4774a960478194ed060da0155dc1aad25ad15c1059acec3a40007b9aba4
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to "Fnma loan servicing guidelines". The PDF also contains a large number of links, many of which point to benign Shopify domains, but also includes links to potentially malicious infrastructure, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=fnma+loan+servicing+guidelines
    • http://files.xbowltd.net/uploads/1/3/0/9/130969801/bb112c.pdf
    • http://zumej.iamwhatiart.net/uploads/1/3/1/6/131606174/66b9e2.pdf
    • http://files.nursinghomeneglectatty.com/uploads/1/3/1/3/131398479/nivenajatovodi.pdf
    • http://kijopobo.kellymichellebaker.com/uploads/1/3/0/8/130874679/5673650.pdf
    • http://files.lisamccafferty.com/uploads/1/3/1/3/131383664/bamibitamurata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/national_anthem_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/38225207047.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/56470360035.pdf
    • https://cdn.shopify.com/s/files/1/0431/6561/4234/files/doxoregerobaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2276/1635/files/nujatujoluvorevijifesav.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/anaphylaxis_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/83005885607.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/xijemolo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/bibapoxulazogikodisemunes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/93488049885.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0807/files/stakeholder_analysis_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/vuwitinap.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_off0000616a.bin
53540603d7fd2091815190ad6d63276ab371fab7246e75d23f8e79211111c104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 5272 bytes
font_01_sfnt_off00007341.bin
e25c3edde635b9f6a83ddc83a54ff7b5354e50b48765b1c9c749dfb398c295d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7341 10312 bytes

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