Malicious PDF — malware analysis report

Static analysis result for SHA-256 84804e44fc20dbe4…

MALICIOUS

PDF

60.1 KB Created: 2020-07-30 17:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17fecd9de455f0aeb8b4e07286a89c44 SHA-1: e72ae754bda153ff0e8a4c1b62515c70169cb13e SHA-256: 84804e44fc20dbe46d84e2291a5065f0dc0717a52ab4517743d79ff0a9a2ddeb
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.ru/pify?keyword=blackguard+book+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of the malicious redirector and the link farm structure strongly suggests an attempt to redirect users to harmful content.

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=blackguard+book+pdf
    • http://files.littlepicassobaltimore.com/uploads/1/3/1/4/131453206/bomaroluxameje.pdf
    • http://files.koshtex.com/uploads/1/3/1/6/131606822/378629.pdf
    • http://files.dreyfus-emerson.com/uploads/1/3/2/6/132696111/nopuxadodatunapom.pdf
    • http://files.xmmphoto.com/uploads/1/3/1/4/131437254/a4b55fc7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasukeseduvemuledup.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/38146877511.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/tazufanukezotefexadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/vutetolafezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/644203674.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/12006235510.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/65651667208.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/27824911891.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_off0000adf6.bin
1d66c522c1cd759dacf0d261465d66fc3a399d8a8df734e1929a3ef54c629940
pdf-font-stream PDF embedded font (sfnt) at offset 0xADF6 4928 bytes
font_01_sfnt_off0000bebd.bin
33c19cf5f4577f94c582e7fb7908edd0f73b7813c15b70935a7199122a29d0ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBD 10696 bytes