Malicious PDF — malware analysis report

Static analysis result for SHA-256 70305e78ed7746ae…

MALICIOUS

PDF

46.2 KB Created: 2020-08-12 20:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0065cdbeeee5449539b92fe9835411b5 SHA-1: 5d67e1dd0f4e5459f337ee4fd448da726d5ba6b6 SHA-256: 70305e78ed7746ae01f951cc493b36a62c6b6d7b9cff4ee13252abcd62bac2f6
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'sustainable development undp pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to redirect users to a phishing or scam site.

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/wb?keyword=sustainable%20development%20undp%20pdf
    • http://files.premierprescotthomes.com/uploads/1/3/1/3/131379554/f0234f4.pdf
    • http://nufijex.dallasapwu.org/uploads/1/3/0/7/130775923/2707809.pdf
    • http://files.rhapsodyartbarn.com/uploads/1/3/0/8/130813906/4372672.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/xumatomujidopasizuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/norazubuxosusewod.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/lexixobibemofaxeka.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/nuwuviperixezumakape.pdf
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/i_dont_have_java._exe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24221046066.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9011/files/godabifagabosina.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/fapuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/3427/1126/files/60475746135.pdf
    • https://cdn.shopify.com/s/files/1/0437/3089/4999/files/calcium_phosphorus_metabolism.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/75470775521.pdf
    • https://cdn.shopify.com/s/files/1/0448/1371/3570/files/back_stretching_exercises_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0435/2642/2696/files/11085657543.pdf
    • https://cdn.shopify.com/s/files/1/0433/9843/0876/files/menstrual_hygiene_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000685b.bin
5ad062b6e161c76b15e53a0e39eb1a2e462435da226a7113c46d983b05811451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685B 5276 bytes
font_01_sfnt_off00007a31.bin
f9a7697a1973d625fb35dfb9d902d4860b49704ff23fcfeab9303db6243f989b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 10408 bytes
font_02_sfnt_off00009dbe.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBE 4324 bytes

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