Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bb3a11d859baa5…

MALICIOUS

PDF

49.3 KB Created: 2020-08-26 01:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ed0e515bb76ad5b1905b7ac5207ac3c SHA-1: 042a0a215aa04e1ecedf3042d1e6cb9ec398630b SHA-256: 13bb3a11d859baa5692f0758695859ea1d19b0a1f31f4c10d056f57f6c147363
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 external PDF files, suggesting a link farm or redirection scheme. One prominent URL, 'https://ttraff.cc/pify?keyword=little+snitch+download', is identified as a malicious redirector, indicating an attempt to lead the user to a harmful destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely to distribute malware or lead to phishing sites.

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=little+snitch+download
    • http://files.lyndahiggsphotography.com/uploads/1/3/1/4/131437322/1c28b9d98a.pdf
    • http://files.soapbylaurelstone.com/uploads/1/3/0/7/130775342/pokijuzesopese.pdf
    • http://files.vinoforvasculitis.com/uploads/1/3/1/8/131872015/fusasus.pdf
    • http://motula.austincountyems.com/uploads/1/3/0/7/130738714/valudavos-jajimimimowiniv.pdf
    • http://files.vanessamarieink.com/uploads/1/3/2/6/132681342/7272719.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/vixulakamadipuzadogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/bimarubewize.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/powunenerakafonen.pdf
    • https://cdn.shopify.com/s/files/1/0430/7854/9665/files/16681202083.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/zipiselokarinebotu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7883/5606/files/cerita_anak_muslim.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/bukuraliwadolamexozasaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/6666/8694/files/zaxopaxatesewikavirete.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/dinilatigewewobonidil.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/kunewutaxop.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/kathi_video_songs_hd_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/20412497550.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/jointer_safety_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/8104767081.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2213/files/kojeliresor.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_off00008322.bin
422c5f730a21d60a2fa5eb0f0cd8a268e54e8dd38131f3fd83828ae91f8861b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8322 4964 bytes
font_01_sfnt_off00009410.bin
9a9c2009645e5933b6e2ca8ac888fb9cdcdfdbb7c111797856e81c64698b1a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9410 10652 bytes

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