Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec493f568456805…

MALICIOUS

PDF

52.5 KB Created: 2020-08-29 08:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e0c407f2de142ee468a6a805c44653 SHA-1: 6b325e3848282db93990d8668067c1d236b4c2bc SHA-256: fec493f568456805152f4c48798d4350d20fe8deffc38efcbe042b8ba4b5628f
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also assigned a very high probability of maliciousness. The document body contains a URL that points to a known malicious redirector, suggesting the primary purpose is to lure users to malicious infrastructure. The presence of numerous other links hosted on Shopify further supports the link farm tactic.

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=time+tables+chart+1-1000
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/background_change_photo_editor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/pokewuwupesovedeguxijoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1015/files/79594166828.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/dogadoxox.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/path_1_3_3_9_0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/mac_app_store_not_ing_xcode.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/suffix_ly_worksheets_grade_4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c84bc509c82e4486b3a31c1d0b4ac0c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2db488a7fe6540bab5e45ad1efd8d673.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce0224cb33c94551bada674aecdb7dcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_89af1cebea5c4564bcfc073afd3a64d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_1323afbf5d63474986d1bf792f06744d.pdf
    • https://static.usrfiles.com/ugd/b8c837_abc3e969c28c46319a7b45abb7b66b16.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/
    • https://cdn.shopify.com/s/files/1/0429

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008633.bin
7a0f8f14bc19e2de95153e77c18aa2a5ead3f27d58af107fd1a82e6c05523851
pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 5352 bytes
font_01_sfnt_off00009842.bin
2b0a3d69d994faadf1edfa4aec215bd714a378a5142ee048e65a3a1141d9bfd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9842 13400 bytes