Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe5ec4c53d80454…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 08:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 941fb418e480f036aaee8392ab0d711a SHA-1: caca86c62a50d1dfb176f49f7b23cccec59564e2 SHA-256: 7fe5ec4c53d804545d3dd74f3e2661345f9f054a696d395252ab1202e197d798
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The document body itself is heavily obfuscated and appears to contain the malicious URL.

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/wix?keyword=el+abrazo+de+amor+del+universo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/2f8cea_6f4e7d153d8d44e78eb13814d2fd3c38.pdf
    • https://static.usrfiles.com/ugd/b8c837_5fae1981a58441c5b2a9f72fd19e324e.pdf
    • https://static.usrfiles.com/ugd/b56239_b6173fde7bc8456fa438d98e79363914.pdf
    • https://static.usrfiles.com/ugd/d1c05f_3e7f2cccabde475dbb2a76885c3fa471.pdf
    • https://static.usrfiles.com/ugd/a107db_27f8f8b6a2104152991181a417d442eb.pdf
    • https://static.usrfiles.com/ugd/b47706_6a1bea7aa223461c8ccf22c7ccce4d27.pdf
    • https://static.usrfiles.com/ugd/c0b427_597383562ea8422a9320c47b8404332a.pdf
    • https://static.usrfiles.com/ugd/9904c2_b45ae56a3f4b45118d8dc5d07ffd62e3.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5754/files/ranuwawejubonula.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/zubanedoxuwozuxajagojufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/1461273615.pdf
    • https://cdn.shopify.com/s/files/1/0460/7141/4948/files/60969930813.pdf
    • https://cdn.shopify.com/s/files/1/0437/6251/6122/files/thankyou_com_selectandcredit.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/jedetajik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/organic_chemistry_notes_class_12_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/88159871000.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672f.bin
9eec93575c60c38eb398695daee581b561ce276649e69a0b902f992b81f2bb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672F 4980 bytes
font_01_sfnt_off00007801.bin
52a2a4c1b2d9578fad8339ed4dced32f7765d929e8ff22b522ac3a37779ab218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7801 11208 bytes
font_02_sfnt_off00009caf.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAF 4324 bytes

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