Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6d339feab51588…

MALICIOUS

PDF

44.9 KB Created: 2020-08-08 09:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dbeafee4a668caa66e6a96f2ce25ea9 SHA-1: 242dad3e4646ba0f60cb180c956aaefb99e092df SHA-256: 5c6d339feab51588553dd5b258a37c93d24b625d5820f0119a29c86ed0d6d121
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a known malicious domain, suggesting an attempt to redirect users to a malicious site. The presence of numerous external PDF links, many pointing to Shopify, further indicates a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=dark+psychology+101+book+pdf
    • http://files.mindfulmoves.net/uploads/1/3/1/4/131437885/sagavowan.pdf
    • http://vosik.mtalamasleal.com/uploads/1/3/1/3/131398140/ratovunetume_rewurukuzupo_fupoxofosixik.pdf
    • http://nipusi.bexleynas.co.uk/uploads/1/3/1/8/131858685/8875236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/tutorial_on_java_programming_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/jogubodawafobiled.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9394/files/rafemimekawedonudifotujiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/jutegatinelanitud.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/countable_and_uncountable_nouns_list_food.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/avast_activation_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/kejukiluturavinerura.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/belivatovumowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/96098753908.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_off000065c9.bin
12f45e759398c9e78740accc5c498b6401b058b8aafe178e8e926d57252f23de
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C9 5916 bytes
font_01_sfnt_off000079fd.bin
c55a6fdbd9fc648f5ee5409ae48b14de0a496b9a139d5432be4e81d16a161aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 14004 bytes