Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d887eae9cf6a327…

MALICIOUS

PDF

35.2 KB Created: 2020-08-21 14:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13cfe009808b259471a7fcd812bd2cb8 SHA-1: 70ecff482c77b9de6d4837c13c35563c1e3afbcc SHA-256: 4d887eae9cf6a327e838d03b069db3f9cd908df3e86863223a47319b20b27224
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to 'choir sheet music pdf', which is likely a pretext to entice users to click the malicious link. The PDF_SEO_LINK_FARM heuristic further suggests this PDF is part of a larger network of linked documents designed for SEO manipulation, likely to increase visibility of the malicious redirector.

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=choir+sheet+music+pdf
    • http://xuzuxukas.davidstaniforth.co.uk/uploads/1/3/2/7/132740505/veputitegese.pdf
    • https://cdn.shopify.com/s/files/1/0434/8497/1173/files/48278488692.pdf
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/atlanta_united_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0430/3696/7063/files/98435782631.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0737/files/number_patterns_worksheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/sinuvazixagerijijoxepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6725/2629/files/70680242298.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9616/files/69101158192.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/43662049040.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_off00004cff.bin
09cc16d715afb8e130691603018a1b0aeb83b8fed88795701f1a71c8116da27e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CFF 5056 bytes
font_01_sfnt_off00005e0f.bin
0c2f0b0c04fd840c96482cb35e652360c24209fae8cd49053a478371dd8514b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0F 10084 bytes

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