Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb5011c4aecce13…

MALICIOUS

PDF

50.6 KB Created: 2020-09-02 00:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fba555a0971c792605fb806c6c257fe SHA-1: 895b28f16058d0a52ed14beb66bc0a8f97199063 SHA-256: 7fb5011c4aecce131ca0569f1b2a641a9a856724f883074062c88921bf2971f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=flower+coloring+sheets+for+kindergarten', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and numerous other Shopify links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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=flower+coloring+sheets+for+kindergarten
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/robavonereti.pdf
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/lududexexukeditelodofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7283/1134/files/social_skills_problem_solving_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4178/files/cracks_movie_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jomopebexifupuruxun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9072/3487/files/5557869679.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/what_i_wish_i_knew_before_i_got_married.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/rowuzuzaluzewifiwi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/cervical_spine_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8588/files/62177533120.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1447/files/breville_bread_maker_bb280_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/belkin_router_monitor_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/6510/4791/files/veterinary_microbiology_laboratory_manual.pdf
    • https://static.usrfiles.com/ugd/963627_51b4c37d4e2e43feb8cf9d64f0d7a60f.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_a965d5f4eddf497ba2a43debc1cacaa5.pdf
    • https://static.usrfiles.com/ugd/a382ee_16f534f74fd44c5a9f9ffa4794ec7856.pdf
    • https://static.usrfiles.com/ugd/26481d_1ee7e39f48f24d4ab736b09a1ce54da4.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_off00007e5b.bin
a9ab42ee8114df1d2c291c1c9dbaaa2cbdabc71f1346f93ac16e1e3177b3e868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5B 5392 bytes
font_01_sfnt_off000090c3.bin
5f74bc3ae0610c1be8090d39cdd04329aa3174084a85d80e58de4d0d6b61431c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C3 14068 bytes

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