Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f869f9fe00832c…

MALICIOUS

PDF

37.9 KB Created: 2020-08-11 05:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a49a0300be3b7c09f7f0b6247a3b525 SHA-1: 8a7b0a62126a7f985c3eaf510a10a8da80e9e6aa SHA-256: e1f869f9fe00832cfa4d263b07575a25ab9c1ee81ac746402b699c338a8a959f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=libros+de+instrumentacion+industrial+pdf+gratis'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=libros+de+instrumentacion+industrial+pdf+gratis
    • http://files.baskervilletravel.us/uploads/1/3/1/3/131379343/wilebajefovek.pdf
    • http://xitasir.soireeseventsrentals.com/uploads/1/3/1/4/131408280/8b18584.pdf
    • http://files.muscarii.com/uploads/1/3/1/3/131383838/4987539.pdf
    • http://zurumodo.luxuryboutiqueamerica.com/uploads/1/3/2/6/132682646/4314851.pdf
    • http://files.manasseroproperties.com/uploads/1/3/1/4/131454172/xunirutewamax.pdf
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/28711724690.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/25617455998.pdf
    • https://cdn.shopify.com/s/files/1/0449/3633/1419/files/os_axiomas_de_zurique_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/tizikufuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/71025650389.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/registry_tweaks_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/child_adolescent_and_family_development.pdf
    • https://cdn.shopify.com/s/files/1/0438/4194/5760/files/85944594647.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/sufanugafaluvade.pdf
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/aprender_ingles_rapido_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/guxalibituwuxuzil.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_off0000527d.bin
31448c15bd863bfb1fb128e09782cb60708a88b20a5b8e4e0c1bd83834c0267e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527D 5556 bytes
font_01_sfnt_off00006543.bin
8c79444598eff2279d2418f49fe0b25f61b0975e3509fec58961113f5aa5e5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 10792 bytes

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