Malicious PDF — malware analysis report

Static analysis result for SHA-256 132f833eab7cd4ce…

MALICIOUS

PDF

35.5 KB Created: 2020-08-17 16:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb706e0e802b23f41c5392023964b843 SHA-1: 0d45b8d95dcec0512adedec25465d1c8da783106 SHA-256: 132f833eab7cd4ce8f6f5937a081b292192e44506c486d3466b5336ec1ffe27a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though partially garbled, includes the title 'Frogs and toads venn diagram answers' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector link is a high-confidence indicator of 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.ru/pify?keyword=frogs+and+toads+venn+diagram+answers
    • http://zajenuj.ballyporeenns.com/uploads/1/3/1/8/131856703/9314947.pdf
    • http://files.mismacounsellingservice.com/uploads/1/3/0/8/130814680/zunotebunetelid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/76251558214.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/purak.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/arabic_dictionary_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/tefufofavejutuzu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/wavogekegekiforeloxamut.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/3911308792.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/97755891062.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/20611903890.pdf
    • https://cdn.shopify.com/s/files/1/0435/0980/9318/files/41183678090.pdf
    • https://cdn.shopify.com/s/files/1/0436/5513/5390/files/cambridge_pet_for_schools_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/8446/3784/files/xinisenozuj.pdf
    • https://cdn.shopify.com/s/files/1/0451/7065/5381/files/10797744218.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_off00004dea.bin
5696d46322ab378884d440005955909d604f892b7de85a47cb9071ff90b54516
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DEA 5220 bytes
font_01_sfnt_off00005fad.bin
505bb15e8a817dbab60eb24b02dae9241be524043d6db7cc9c36de5d89a7edba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 9860 bytes