Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8e80db8cdc17d1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-26 07:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a0d68395fb37466c06da83c10402c3d SHA-1: c13da0a6af74ce98a83392280e07b21423ce787e SHA-256: 6d8e80db8cdc17d1053390d3f59886257cae3a64c1069fc0c943ddfa3808c485
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and contains numerous external links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text suggesting it is a "math worksheet answer key" which is likely a lure to encourage users to click the embedded malicious links. The primary malicious URL is a redirector that likely leads to further 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.cc/pify?keyword=get+the+message+math+worksheet+answer+key In PDF document text
    • http://dapukon.macroleaders.com.au/uploads/1/3/2/8/132814930/3987192a4cb13b8.pdfIn PDF document text
    • http://files.thedreamplace.store/uploads/1/3/0/9/130969322/5278631.pdfIn PDF document text
    • http://files.kangaroohavenwildliferescue.com.au/uploads/1/3/0/8/130814397/soxavebis.pdfIn PDF document text
    • http://redofuju.brunnerfarm.net/uploads/1/3/0/9/130969483/jemarikanur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/vizowatedujakaxinuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0903/1840/files/wow_mining_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/49450548823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/lebonikix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/wemijuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/propiedades_de_angulos_entre_rectas_paralelas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2879/0946/files/lurigelutavapizipisipipir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3867/7924/files/84645448021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3669/6999/files/dilufasalebukejiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9981/4056/files/cerebellar_ataxia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4437/9546/files/42591411174.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F7 5356 bytes
SHA-256: 52304a4e965c03d6b6305c452bbd62ed067f79122c638ceee82f42ce45651a3e
font_01_sfnt_off00007a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A24 10676 bytes
SHA-256: c40ee9ddc62a53c5a20de712faf5921562ab776f720611dc9f0d6be312a7364c

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