Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e500769d577cbf2…

MALICIOUS

PDF

41.2 KB Created: 2020-08-13 17:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d89823c88984db564cfd5ac06ee1b86c SHA-1: 392ee2117e0a431ca9033d1055985c3b8bc14337 SHA-256: 5e500769d577cbf29e4d74adf2f6fa35a5df457c7e8e7db6e45df8316b1bdc3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to link farms designed to manipulate search engine results. One prominent link redirects to malicious infrastructure, suggesting an attempt to lead the user to a harmful site. The ML classifier also 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.cc/wb?keyword=animal%20cell%20coloring%20worksheet%20quizlet
    • http://files.worldreadyschools.com/uploads/1/3/0/9/130969907/palirumopavatej-nitiz-diloxomagusap.pdf
    • http://files.utspta.org/uploads/1/3/0/9/130969477/goned.pdf
    • http://files.chicagocitylimits.com/uploads/1/3/1/6/131606280/da13cf5bd5a68.pdf
    • http://files.centerlislecongregationalchurch.org/uploads/1/3/0/9/130969791/1e8b3e5b790ba.pdf
    • http://nikudapa.yorkshirecheesestall.com/uploads/1/3/0/7/130775934/gitarojudal_levoguwoses_juwaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1977/9741/files/bug_dragon_pokemon.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/4976603100.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/niwizamezakemulif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7804/9189/files/towesogisugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7454/files/jojofojupudalif.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/20096947836.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5079/files/22330087508.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/58381739490.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/14759884691.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/gst_annual_return_gstr_9.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_off00005f8c.bin
1566f87b2fa2c87e4b657f25330fc2305d00bb0eca1460ec9b1d7c35d7dd9d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 5536 bytes
font_01_sfnt_off0000723b.bin
cfd5039cfa785028643512fd889501f7bf9c7f14c516e8ed0eb887264cc48feb
pdf-font-stream PDF embedded font (sfnt) at offset 0x723B 10872 bytes