Malicious PDF — malware analysis report

Static analysis result for SHA-256 162053f382bc5fca…

MALICIOUS

PDF

42.6 KB Created: 2020-08-11 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9679033b72f382006eb8df9928edd65 SHA-1: 8f57e40183583a9a3ba4d6d899a34bd83744bcf8 SHA-256: 162053f382bc5fcaa23b46c7718da8fc0f412d37b68f2e704a297a0082db41d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious content.

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/wb?keyword=queremos%20que%20seas%20rico%20pdf%20completo
    • http://xevomeveg.funcde.com/uploads/1/3/1/3/131379246/584bc1.pdf
    • http://files.artarmonphysiotherapy.com.au/uploads/1/3/2/7/132740694/nomojiwixop.pdf
    • http://files.dogsbestfriendcr.com/uploads/1/3/0/7/130738708/7878e73e14091.pdf
    • http://files.professionalcapitalpartners.com/uploads/1/3/1/4/131438766/4121815.pdf
    • http://files.centralmississippirobotics.org/uploads/1/3/1/3/131398085/fomegiwufamatirebuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/pasudarunetilu.pdf
    • https://cdn.shopify.com/s/files/1/0453/6067/7019/files/carmilla_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/how_to_read_tenor_clef.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/73518525738.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3510/files/usps_ps_form_6401.pdf
    • https://cdn.shopify.com/s/files/1/0437/5478/2869/files/6803893923.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4846/files/oracle_identity_manager_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/tudebezubewojulitemiweti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/10063349078.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/pomopadeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/gubuwopidarabutere.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/5169389210.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.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_off0000647b.bin
af93e264395370b10418b862d016fd9ebb0a2dd3b830f94d8d017ba54713d7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5488 bytes
font_01_sfnt_off0000770d.bin
ef287709803036810a2a780a0776c499be6eacbffec54042878889e50ce2277b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770D 11296 bytes

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