Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee40b6b1118fe88…

MALICIOUS

PDF

42.4 KB Created: 2020-07-10 09:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb2848fbee0f508265cbafd50920bd4 SHA-1: 560a2ef9281ac26d84fd7062101ddd91408834f9 SHA-256: 8ee40b6b1118fe88e1539dbf5b8da3258fc8b757c1a89bee82cfaaacc8bcdb0c
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, including a known malicious redirector at 'https://ttraff.com/wb?keyword=second%20language%20needs%20analysis%20pdf'. The document also features a link farm with numerous PDF files hosted on various domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness.

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=second%20language%20needs%20analysis%20pdf
    • http://files.phcstark.org/uploads/1/3/1/3/131383581/gejokezixiti.pdf
    • http://files.emmalisterart.com/uploads/1/3/0/8/130814754/xilukevavukume-soxonokaluzusib-xegijameka.pdf
    • http://files.oneclick-photographer.com/uploads/1/3/0/8/130813461/97d5ae7da6c.pdf
    • http://files.tnecmn.com/uploads/1/3/0/8/130813769/1f0683d3e6.pdf
    • http://files.jenniferinafrica.com/uploads/1/3/0/7/130775520/rudulokup-xotodafeb-falixurenutol-muvigizakutola.pdf
    • http://files.visualtommy.com/uploads/1/3/2/6/132695516/gilemonafikuv-doviruve-romab-rulijevo.pdf
    • http://files.dslawnandlandscapes.com/uploads/1/3/1/6/131606854/juwawedasu.pdf
    • http://files.gylrae.co.uk/uploads/1/3/1/4/131406433/wabew-nisojadujukus-gowagubaj.pdf
    • https://mugitemos.files.wordpress.com/2020/06/98597766185.pdf
    • https://fuzevibob.files.wordpress.com/2020/07/xefekosusu.pdf
    • https://voxidotusad.files.wordpress.com/2020/06/wifisopefinilowus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86477918810.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96626323422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujaxitedidubabupopivup.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_off0000673f.bin
996dfa69e5c1ad2466b7be8905d2de627781fb9ff1ca3065d82fc5eae95693a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673F 5232 bytes
font_01_sfnt_off00007914.bin
69ebca066c943882fb55f3d97442a077bdf8c4081a62f476464225f0a52b073d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 10440 bytes

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