Malicious PDF — malware analysis report

Static analysis result for SHA-256 87518ef5412a4f94…

MALICIOUS

PDF

41.4 KB Created: 2020-08-20 18:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43fd3f938148f8df6dcc9fe2ce5c959d SHA-1: 5335b080c337e649931a4044a7f912f7f83fdb8f SHA-256: 87518ef5412a4f948d6478834f3a4f99f0870c53c1ed38f63def8e3e00cfc430
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains a URL that appears to be part of a link farm, potentially for SEO poisoning or distributing malicious content. The ML classifier 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=vshare++for+ios+11
    • http://files.ellibrodeespanol3.com/uploads/1/3/1/0/131069824/fajawefugedurukexovu.pdf
    • http://files.stjohnsstafford.org/uploads/1/3/2/7/132710797/vazajovufad.pdf
    • http://files.americanbeachtour.com/uploads/1/3/1/4/131453252/6aa4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/walmart_supervisor_assessment_test_answers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/97943194208.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/free_background_funny_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/25090841351.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/dimot.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7330/files/kugiwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/fexosaremix.pdf
    • https://cdn.shopify.com/s/files/1/0431/3117/5063/files/61936638934.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_off0000637f.bin
51504ac921a1e2ca957a9f5af9bca301305ea1540652863aa656b27977b93d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 4840 bytes
font_01_sfnt_off000073f5.bin
0d5d92567d8eff9fa626d18f7e5bf006f92472e9aa3557eba66c354a1d8a264e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F5 11004 bytes

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