Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2783ebfd49f239…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 14:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a61dde0de906fce03efb5e00683e6c59 SHA-1: 500f3ed83d2d66444fce1686ba5dc561a96ad1e8 SHA-256: 5b2783ebfd49f2398689fea62a9ac04d490ff87c363678e106659b3e55135750
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on Shopify and other file-sharing sites, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=everything+i+never+told+you+online+pdf+free+download', is flagged as malicious, indicating a redirection to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=everything+i+never+told+you+online+pdf+free+download
    • http://files.cheezelo.com/uploads/1/3/0/8/130874086/6874935.pdf
    • http://files.edmontonchineseschool.com/uploads/1/3/0/9/130969305/woderanazojokonijoz.pdf
    • http://files.daffodilacres.com/uploads/1/3/0/7/130775171/6878424.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/sovumudipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/solo_leveling_light_novel_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/10493713431.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9803/files/vocabulario_kaqchikel.pdf
    • https://cdn.shopify.com/s/files/1/0440/7099/4085/files/togelitirolotipala.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/68145100923.pdf
    • https://cdn.shopify.com/s/files/1/0428/2243/4972/files/relili.pdf
    • https://cdn.shopify.com/s/files/1/0444/4487/6966/files/administrao_estratgica_de_recursos_humanos.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/tennessee_driver_license_reinstatement_office_memphis_tn.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/zibupuluxugugikikekesesef.pdf
    • https://cdn.shopify.com/s/files/1/0437/2214/5943/files/nujunojizudazurelidideru.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/59760668792.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/60719235234.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/pusetagel.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_off000062d4.bin
863e1d4d0c758af3fc907c0967200facb1f84b226a63cff5416d7521dd2455b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 5336 bytes
font_01_sfnt_off00007514.bin
c2aaf27c4287e298ddbafaf3e285aeef4259520a9dfda2e0d8317b5f2515571a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7514 10732 bytes

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