Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8f0a31d2b5efde…

MALICIOUS

PDF

57.0 KB Created: 2020-08-11 13:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a754ac3922d4129a4090194c258ae8 SHA-1: e872a950a3983963d470012a1cea3a205b1bb3d9 SHA-256: 2c8f0a31d2b5efdee27861887b42d2c93d703d275e543594d008fcde8db5a01f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link 'https://ttraff.ru/pify?keyword=calendario+torneo+apertura+2020+pdf' leads to known malicious infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests a large number of external links, likely for SEO manipulation or to host further malicious 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.ru/pify?keyword=calendario+torneo+apertura+2020+pdf
    • http://files.hayfieldsecondarychoirs.com/uploads/1/3/0/7/130738554/detexudi.pdf
    • http://files.wallingfordphoto.club/uploads/1/3/1/3/131379252/medatugoji-lewupewezilo.pdf
    • http://files.sarahrockett.com/uploads/1/3/0/7/130776120/misaxuletakog.pdf
    • http://files.bloomingtonbobcatshomeschoolathletics.com/uploads/1/3/0/9/130969683/pivefijexupo-butez-relot.pdf
    • http://files.australianislamiclibrary.org/uploads/1/3/1/3/131378774/0f863.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/junimomekudefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6455/files/final_fantasy_7_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/vajebizexafabuxokafesupan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/bipapi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/jawenisisufifewosutol.pdf
    • https://cdn.shopify.com/s/files/1/0430/3545/9738/files/sozakuvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/3221874408.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3564/files/sagapolakajij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/rukuzikid.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/bukeru.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/87087624923.pdf
    • https://cdn.shopify.com/s/files/1/0433/7627/9702/files/3170816719.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_off000086f4.bin
6ddedc846656d8ef59a922b3dbae9424dbe8a0ea476cb93a236ff6792919d5ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F4 5036 bytes
font_01_sfnt_off00009822.bin
4ab6f965d6930ef0b0d8e22806fc92174d1c7411ccd085386d183ce68b1a4b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9822 15864 bytes
font_02_sfnt_off0000c819.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 4324 bytes

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