Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f424c44c6214444…

MALICIOUS

PDF

50.8 KB Created: 2020-08-08 07:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73bd40595b49a848748e5a5f353ca49f SHA-1: dd49ff5fc6ce65e2ca794bf9b3037c42691537a8 SHA-256: 5f424c44c62144448dc3dcbca0d21500ca3fe7ed87872be474a4873d2446ffe0
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 Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a direct link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=solucion+hipertonica+para+nebulizar+preparacion+pdf`. This indicates the document's primary purpose is to lure users to malicious sites.

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=solucion+hipertonica+para+nebulizar+preparacion+pdf
    • http://files.dixbaines.com/uploads/1/3/0/7/130775977/kelazulivaxixam_rumowakusexi.pdf
    • http://files.kreationsbykayonline.com/uploads/1/3/2/6/132681464/2041792.pdf
    • http://files.auchengreeclydesdales.com/uploads/1/3/1/1/131164372/timagibix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/31097162753.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/html_page_to_using_php.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5380/files/96596898762.pdf
    • https://cdn.shopify.com/s/files/1/0437/3777/6289/files/gmp_good_manufacturing_practices.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/99363505072.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7894/files/14924439554.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/mechanism_of_cell_differentiation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewobaropelizovijekozuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/blackthorn_key_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/duxosuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/35995353044.pdf
    • https://cdn.shopify.com/s/files/1/0431/2242/6013/files/91921248877.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006163.bin
888a56a569e50610a8f7cc2e83e83c57aea8c196959031cd08ba710a424b147e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 5240 bytes
font_01_sfnt_off00007319.bin
0092c6e91b942eb6d08e322280e22084d143e4d6aeb97c263f28bf4fe9bcd1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 11516 bytes
font_02_sfnt_off000098b9.bin
b64ee549dcc6ee6e49e3acfc8f8bb9ca4302a91d4b0f8748d081377a3b4e097d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B9 16076 bytes
font_03_sfnt_off0000ad63.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 4324 bytes

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