Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ed7e82d19f0552…

MALICIOUS

PDF

48.0 KB Created: 2020-08-29 03:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89d6d8260d1927d4ce6b5b49044dac27 SHA-1: 8f9082773bbdc69f51b842151d563f78a9b4e0ee SHA-256: 13ed7e82d19f055276885895533d213f0385c2486370911b0ff906d40aea78fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF containing a large number of embedded links, many of which point to benign Shopify URLs but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to obscure the final malicious destination. 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.com/wix?keyword=componentes+de+la+protesis+parcial+r
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/7951/6569/files/veg_lasagna_recipe_with_lasagne_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9789/files/99492387447.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/92867067056.pdf
    • https://cdn.shopify.com/s/files/1/0429/2031/2991/files/38206757874.pdf
    • https://static.usrfiles.com/ugd/b8c837_5dc7d1a3b54f46cab3f3f3eb7a888fe6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b55338f3f43d49a18448804fdfe86bdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_701b8985ac11465f8bac312c70df71e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6919ffb555e6458f9eca6a2dadef92d9.pdf
    • https://cdn.shopify.com/s/files/1/0452/5365/6738/files/arthur_pink_attributes_of_god.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/excel_sum_indirect_another_sheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_d522fef8a48d4e3282b1f9b59ca8513c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6955e9d84cd848d2a21972a51ac05b6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_47cf9e6eac244b3f9003590006603f2f.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_off00007af1.bin
dee9f8456976782b0a32d7b50c1241ccf9e34332d3d5a8247fa167212e7bdc9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF1 5124 bytes
font_01_sfnt_off00008c39.bin
d35cdc16780deaefeff6411937347542b452bff333ae9e3f5c503df2d1b71068
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C39 11408 bytes