Malicious PDF — malware analysis report

Static analysis result for SHA-256 c728cb08d83f9a2a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-04 16:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fbda4db063eea36605cc03d06bbd545 SHA-1: c000f72c42137dad234d6fdf9b8a1d5b75f8d6fd SHA-256: c728cb08d83f9a2a8277f1f50e01c24e862828d1107f651f77157fadf8c563c9
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that one of the primary URLs, 'https://ttraff.com/pify?keyword=cartoon+images+for+colouring+pdf', leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic further confirms the nature of the document as a link farm, with numerous links to external PDFs, many hosted on cdn.shopify.com. The document body, though partially corrupted, contains text related to 'Cartoon images for colouring pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to entice users to click the embedded links.

Heuristics 3

  • 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.
  • 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=cartoon+images+for+colouring+pdf
    • http://files.highdemandhair.com/uploads/1/3/1/3/131380845/merabipetuxopobogera.pdf
    • http://files.bellalusso.us/uploads/1/3/1/4/131437949/9606629.pdf
    • http://files.boaianimalcentre.org/uploads/1/3/0/8/130873930/fd6dee4.pdf
    • http://files.saugushighschoollearningcommons.org/uploads/1/3/0/9/130969791/8515688.pdf
    • http://files.cemmethod.net/uploads/1/3/2/6/132696249/niwipun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/fabiramugadetozeba.pdf
    • https://cdn.shopify.com/s/files/1/0446/4531/8819/files/conceito_de_atmosfera.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/nifapokimus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8986/files/werumupolefufabetusuto.pdf
    • https://cdn.shopify.com/s/files/1/0437/9059/8305/files/21793071684.pdf
    • https://cdn.shopify.com/s/files/1/0437/3312/3221/files/vasem.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2320/files/81684882012.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/atul_prakashan_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/8241/6281/files/36256757970.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1970/files/ms_pooja_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/relaniwomuguzixiso.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/lilowejise.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f7.bin
74d569de8344d52a85b3ceb46ea1c539afa2df5a4b6b45f5dc04b0aa78baebd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F7 5380 bytes
font_01_sfnt_off0000772c.bin
533ac58edec4871c9d702f33fa91712bfe475d89769f020500edd8384a777612
pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 10060 bytes