Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f437a7e41f3d2d…

MALICIOUS

PDF

51.3 KB Created: 2020-08-31 00:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6797591ff917b4bfa910c4baf9bc76 SHA-1: a265cc86f13d290023b8e0fe7d9550a764a23ef3 SHA-256: 82f437a7e41f3d2d8d0adf85e3c63351d9f6dd4b658c898edb5cbdf835c89466
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed to appear as educational content, but the primary link redirects to a known malicious domain. This indicates a social engineering attack aimed at luring users to a harmful website. The document body, though heavily corrupted, contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting it was programmatically created to host these links.

Heuristics 3

  • 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.
  • 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/wix?keyword=ense%25C3%25B1anza+situada+frida+diaz+barriga+mapa+conceptual
    • https://cdn.shopify.com/s/files/1/0465/3645/8399/files/liniteme.pdf
    • https://cdn.shopify.com/s/files/1/0434/9342/5316/files/78742460442.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/ranukujate.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/blogger_api_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/decimals_in_words_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/xufekewopet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/rezilitesabokobegepun.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/functional_foods_benefits_concerns_and_challenges.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4838/files/dsssb_ldc_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/73081871844.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/81980300006.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/sinamogexufepemeranuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/verb_to_have_present_simple_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/new_year_accidents.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69143450337.pdf
    • https://cdn.shopify.com/s/files/1/0452/5257/5394/files/3d_shapes_worksheets_for_grade_3.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076ff.bin
15f0ed2405f3298e9164500879d57dd7b6a4301afc5ecfc945704c1592096120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FF 5832 bytes
font_01_sfnt_off00008a73.bin
df1af89553f9790467eb614c7dba1df77416ab852ddce3e7b359503b6c32c15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A73 17112 bytes

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