Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f86d46db2a9e7b…

MALICIOUS

PDF

45.5 KB Created: 2020-08-20 19:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53a99eed40e53cb252f21151e4b03b41 SHA-1: 86a1d59d88d61623972dffd28512c661d7c034d5 SHA-256: 70f86d46db2a9e7b8699d333d74600a5ee8e98fd30dbdbfc54c666aa62bd27b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and contains a significant number of embedded links, many of which point to a link farm. One of the primary links directs to a known malicious redirector. The document body contains garbled text but also includes the malicious URL and several other PDF links, suggesting a content-scraping or SEO-spamming operation.

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=liver+vascular+malformation+radiopaedia
    • http://files.islandqueenproductions.com/uploads/1/3/1/3/131383791/b1e94fc91b8cd67.pdf
    • http://lidev.jenreidphotoart.com/uploads/1/3/0/7/130738799/c2db5e7d2aac.pdf
    • http://files.mmorrisld.com/uploads/1/3/0/8/130814900/semorowazamebak-poxojidarele.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/wifixuzegodidodebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/zowixazepivutuwiwerodere.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/free_blank_contractor_invoice_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/kadidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0430/6151/0293/files/92382794927.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/bigg_boss_season_3_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0428/1889/6038/files/tebemubadiwewagu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/66606600151.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/88064577504.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/52922760752.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/big_data_analytics_course_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/bulk_rename_utility.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_off00006d16.bin
c656ab8f5a3cdea60aa1c2f9fc2dd917556b0158c8a8495a1186c93c62fa44be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D16 5304 bytes
font_01_sfnt_off00007f0c.bin
d3de309b42a26629fab62dab5e6af8c531ec6f4a9798c7103f1085e285ba7967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0C 13132 bytes

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