Malicious PDF — malware analysis report

Static analysis result for SHA-256 926fe0552d536999…

MALICIOUS

PDF

40.8 KB Created: 2020-08-24 04:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6024ea62a5a4a070bfacdb56cb0be4b SHA-1: 0b0136cccb0f9525f590db1a3c1abe02fe821518 SHA-256: 926fe0552d536999eb41694f2ef13c453330550233a6fc6336d1ae34e203d1d6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The document body, though partially garbled, contains text related to "Top 10 hip hop music sites" and the malicious redirector URL, suggesting a lure to drive traffic to malicious infrastructure. 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.cc/pify?keyword=top+10+hip+hop+music++sites
    • http://files.marquialewisfoundation.org/uploads/1/3/1/4/131408798/suwulux.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/20362256281.pdf
    • https://cdn.shopify.com/s/files/1/0435/1760/8090/files/57991081845.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/malivesesal.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/coreldraw_x5_bagas31.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/54107632127.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/xejoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/87837794729.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/34749909837.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_off00006204.bin
6eb975ec0db77515bf54eab1c1b04dad8578e0b299b579652234cc8de1638ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 4976 bytes
font_01_sfnt_off000072dc.bin
14aca00dabc5546b7abb5295c66f151402b6b768aec7309cf8177966047eb579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DC 10532 bytes

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