Malicious PDF — malware analysis report

Static analysis result for SHA-256 681051b5f211db72…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 20:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56584ed98a5af72cbd8166cbac95e1b6 SHA-1: f376c00664afcfe2734b0f46aea522013443de01 SHA-256: 681051b5f211db726a7edc28ac146b3e5dd2df6daead06851aee44950fcfab8e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised with a seemingly innocuous keyword. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this behavior. Additionally, the PDF hosts a large number of external links, suggesting a link farm or SEO abuse tactic, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. No scripts were extracted, but the presence of embedded URLs and the ML classification strongly suggest malicious intent.

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.com/pify?keyword=daily+chores+chart+template
    • http://loxupikek.toscanointeriors.com/uploads/1/3/1/4/131407668/gefatavigima-gowejejelava.pdf
    • http://files.onceinmanhood.com/uploads/1/3/2/7/132740923/sirun.pdf
    • http://files.anchorcounselingservices.com/uploads/1/3/1/3/131379262/183393.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5973/0839/files/burger_king_job_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/93003965477.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/marketing_channels_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6374/6466/files/tolaxavotosuwupuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/70639432435.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/faterer.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/similar_triangles_review.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/54323661228.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0540/files/3rd_grade_math_diagnostic_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/lanasozoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/nudurajevopapunubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/94011970270.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/xidaba.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/82400304157.pdf
    • https://cdn.shopify.com/s/files/1/0435/6489/2323/files/suzizupedisevokozologewi.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_off00007546.bin
256790c3891f652a4e69b4a900d3b20323c15afe7bc7f26aa7604772c7728e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 5272 bytes
font_01_sfnt_off0000871a.bin
194c6fa85356fe0358e55956d213d7a6f1bc282b7f7f85b512997a81b19a7b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871A 9976 bytes

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