Malicious PDF — malware analysis report

Static analysis result for SHA-256 980a57f3acc792f5…

MALICIOUS

PDF

44.1 KB Created: 2020-08-01 17:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c4a7883145320259f5003f19c29a24 SHA-1: c7bd204ed3125b79b63d7990eac02d75802eede7 SHA-256: 980a57f3acc792f5e98b7f54af92d62ef8c2bcf717847d8145dfab808bf61863
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to other PDF files hosted on various domains, constituting a link farm. One of these links redirects to a known malicious URL, ttraff.cc, indicating a potential phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

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=milliseconds+in+an+hour
    • http://files.thegoldenruleboutique.com/uploads/1/3/1/3/131398019/45a71fb64b9c9e.pdf
    • http://files.chefmercogliano.com/uploads/1/3/1/0/131070331/vevakepobefuwol_wemuw_kozuxomozoja.pdf
    • http://files.straymongrel.com/uploads/1/3/1/8/131871894/4cc60b638a0f8e.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/61934601788.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/94410649314.pdf
    • https://cdn.shopify.com/s/files/1/0432/0198/6723/files/13994601633.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/28606621326.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/82315962459.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/kanejopefizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/tupiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/pozepatikupuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/58393111201.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/zunaxusutajedubuzenu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6702/2239/files/mebifenadidezosef.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/15661115956.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005af1.bin
2b1e6cb1e8d9a913c4d78c2070477af4402f6bd10a91ab1dfe9ab3f026c05778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF1 5032 bytes
font_01_sfnt_off00006c0c.bin
eaca1f4708234b6fe11e636fda89eb39ce464be2949677d31e9e03e609ae1ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0C 9948 bytes
font_02_sfnt_off00008e10.bin
9aaf374d64521945a2d179b3de22a0ad451813c1e8d23897d9514ef9876b453b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E10 16216 bytes

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