Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0430022a131c5a…

MALICIOUS

PDF

49.7 KB Created: 2020-07-23 14:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d887b43adb7187ebe9003f65ac9a140d SHA-1: 8b358a2e3cec2b051e17e2f3b18e9d964cdf3851 SHA-256: 2c0430022a131c5aca7286dd14e15a3ef377ea48534b73a22b88c1741eebd926
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a 'PDF link farm'. One of these links, 'https://ttraff.com/wb?keyword=atrofia%20del%20nervio%20optico%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content that can be used for malicious redirection.

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=atrofia%20del%20nervio%20optico%20pdf
    • http://files.jacintaviolin.com/uploads/1/3/1/6/131637224/liritoro_jisivoke_figirogopaluzul_fatoxi.pdf
    • http://files.galmeychurch.org/uploads/1/3/0/9/130969800/6635732.pdf
    • http://files.everaftercharacter.co/uploads/1/3/1/4/131483344/luleguwu.pdf
    • http://files.drawingonmusic.com/uploads/1/3/1/0/131070044/mupesibudunug-womexezaluzo.pdf
    • http://files.claymark.net/uploads/1/3/0/8/130874489/1725249.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/11758596472.pdf
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/29734131695.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/vilofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4732/files/20648058819.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/piwubixisagukika.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/28068001597.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/26413977664.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/74813555012.pdf
    • https://cdn.shopify.com/s/files/1/0440/6404/7269/files/79585399330.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44628440260.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/72355848336.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/sitawavub.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/
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/piwubixisaguki

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008160.bin
e90112518c7d420c1abc2724304626b0b09b9768c991416561adef1da2ac404b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8160 4808 bytes
font_01_sfnt_off000091c7.bin
8d209c48adf9168c1f23d1e9a68a32ccfdd028af0b309e6b6ad711491b30b690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C7 11844 bytes

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