Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7c77ca3f929df5…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 16:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8a1871dd6afbca6743922a6371613d9 SHA-1: 0adfbfe7a463eb1cd13b6853921af31fe4844287 SHA-256: 0d7c77ca3f929df5ab4b144dfeae9c3fefc281ad829bb76413a6afccabb027f7
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, but one critical link directs to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting an attempt to lure users to malicious infrastructure.

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=cours+d+orthographe+ce1+pdf
    • http://files.campbellscostarica.com/uploads/1/3/2/7/132740659/5847656.pdf
    • http://files.littlestar-emanations.com/uploads/1/3/1/4/131407047/ace5875f68b2c.pdf
    • http://files.ridemchorses.com/uploads/1/3/2/6/132682585/gesidijoketijaxelapi.pdf
    • http://files.littlecrittersfarm.net/uploads/1/3/0/7/130739544/zerezaguvasevasaveje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/fajufazatudiwudu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2403/0618/files/ashok_kumar_singh_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/flip_tables_emoticon.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/kuzetirikela.pdf
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/13693579719.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85213016947.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/13809528220.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/28806720163.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/jafugaxiguvatubipifi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/25089916659.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/cantilever_building_structure.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/48481737524.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/macos_restart_vnc_server.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_off00005c7e.bin
58912ee1813466ad3f513030ffbbb65411d8d88c9e0f4be4852dc3f069db6631		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7E 5340 bytes
font_01_sfnt_off00006eab.bin
2c4e080a2516875f0e2d6fcf7209b09c5c747f925296ceea7ba171a05cdb079b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAB 14064 bytes

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