Malicious PDF — malware analysis report

Static analysis result for SHA-256 852a5dd1ef9b2b30…

MALICIOUS

PDF

41.9 KB Created: 2020-08-12 20:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e128dace8580757b230b530d52156ea6 SHA-1: 37b51d561b73e5971209c392f7b419dc14903bb6 SHA-256: 852a5dd1ef9b2b30c891615e7749a580652c130757c5131352de6e7a38f89e8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain the URL 'https://ttraff.ru/pify?keyword=breast+cancer+pathology+report+pdf', suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to host 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.ru/pify?keyword=breast+cancer+pathology+report+pdf
    • http://files.lesleyasare.com/uploads/1/3/1/8/131856772/4568504.pdf
    • http://files.lindsaywincherauk.com/uploads/1/3/1/4/131406758/fowujajebamojo.pdf
    • http://sizinezu.sightlux.info/uploads/1/3/1/0/131070306/warisapikego-regudidevixete.pdf
    • http://fituni.paulelwoodkelly.com/uploads/1/3/1/4/131438137/magaxibaf_gipot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/crooked_smile_j_cole.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/botizutukubudag.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/suguterubedapixezodapa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8339/8310/files/7983362586.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/muzipajuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/wivufapumotexoroxeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/kubigurujuxugepeburorerut.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/bookkeeping_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/58145774433.pdf
    • https://cdn.shopify.com/s/files/1/0437/6553/0785/files/important_formulas_in_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0432/8403/7792/files/68414952162.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7655/files/bilamuzojugogazajex.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3006/files/dracopedia_the_bestiary.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_off00006528.bin
373a9e3c1efe35ac3593be861daf45b48fa542d0ef8146d979bbf882c946245b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5568 bytes
font_01_sfnt_off0000780b.bin
a3f99d98ad79f3e3e74a6aff4d798a48dc0cdfec599f4bb33d908a7f315cbfba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780B 10148 bytes

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