Malicious PDF — malware analysis report

Static analysis result for SHA-256 508b1780e529dbc4…

MALICIOUS

PDF

43.9 KB Created: 2020-08-19 14:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c69f0afe80b4a7c0f0c4bb8f2c16a050 SHA-1: 4caefa8d0ebd6810fdc1d04daa1e3e5b036e6050 SHA-256: 508b1780e529dbc44601340ac98e8b71a1061e0e8d9aecb8592cc0a088873061
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is a link farm designed to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body text is largely garbled but contains the malicious URL.

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/pify?keyword=integrated+reporting+committee+of+south+africa
    • http://files.glamorousreputation.com/uploads/1/3/1/6/131606605/pulomume.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/54518811372.pdf
    • https://cdn.shopify.com/s/files/1/0434/6989/7878/files/guzunojugaduv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5571/7271/files/all_banking_terms_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/65390481290.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/55800610614.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/59187312248.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/58392473974.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/bible_dictionary_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/97064627264.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/90258972000.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069bf.bin
1f93cd239c952f1e5df1ede5a56c55e2765805315aa53f2bc917aa4003a91a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BF 5476 bytes
font_01_sfnt_off00007c2e.bin
3a586e304d8473f8525c96b021dde87d987a3b0c7cbaefbe2795e9742468e75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 12080 bytes

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