Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdf4000ca3a72c9…

MALICIOUS

PDF

42.0 KB Created: 2020-08-19 06:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff49d399264af56f64f75301ff9ac84c SHA-1: a8b7fddafd41816f6c9eaa595187775c23b7b45a SHA-256: 0cdf4000ca3a72c95cee59461f76f860d5024831835d1bf4a01ef7ce21d7fcf4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content. The primary malicious indicator is the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, which flags the link to ttraff.com.

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=letter+sounds+worksheets+first+grade
    • http://files.bdickinsonart.com/uploads/1/3/1/6/131637055/gibosefuzoko-dusobeforadewiz-rugawiwe-midogoz.pdf
    • http://files.besselingconstruction.ca/uploads/1/3/1/4/131453256/buxexefa_pokegekitunaj_lomavuxenowuti.pdf
    • http://vabulovaf.jflesher.net/uploads/1/3/0/8/130815017/8270285.pdf
    • http://vazawo.mreshistory.com/uploads/1/3/1/4/131437379/133255.pdf
    • http://files.bagwelldesigns.com/uploads/1/3/2/7/132711954/towija_xuwixinufunobi_damosalujajumak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7609/1046/files/itinerary_travel_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/destroy_all_humans_ps2_iso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/bajekotuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/design_and_analysis_of_algorithms_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/rixekin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/5162590417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/perinexegavozoxak.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4085/files/innocent_smoothie_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/27420234877.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_off000065d3.bin
812e44ddf7728d0e4526c9e6fe0e7b0d0941dccb3bb27fa72d61955787caf8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D3 5232 bytes
font_01_sfnt_off000077b4.bin
a452e078425574a6883801517796a85200c4b044c651c328221d1f0ebac0f0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B4 10176 bytes

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