Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5649f3ebb274c2…

MALICIOUS

PDF

40.1 KB Created: 2020-08-18 14:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1363b664b30e3f716336b61a4693fb78 SHA-1: 370acea7f9912a31e0323dc494c84c3407d81435 SHA-256: 3e5649f3ebb274c2f03d210bed8e53693f33da571b7967387642c0acd63d7c3c
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, many pointing to Shopify domains, but also includes a critical redirector link to 'ttraff.cc'. This suggests a link farm or SEO poisoning attack. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious infrastructure via the embedded links.

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=peacock+ore+mineral+formation
    • http://files.happytailacres.com/uploads/1/3/1/0/131070178/duwowamoz.pdf
    • http://files.annmartin.co.uk/uploads/1/3/0/9/130969761/7841032.pdf
    • https://cdn.shopify.com/s/files/1/0438/0295/1842/files/xisikeludojinifar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/37443207385.pdf
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/5265742893.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/kiguvoki.pdf
    • https://cdn.shopify.com/s/files/1/0437/8876/3298/files/balanceamento_de_reaes_redox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7118/3775/files/e2_80_9cyardstick_e2_80_9d_policy.pdf
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/hul_annual_report_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0439/1079/1323/files/rifiwafebigadekukexexin.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_off00005e3c.bin
f79cae83234f5686608b45bb21bc8ae3053dc4620bf26bbf12c893cd8a4e5fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3C 4912 bytes
font_01_sfnt_off00006edb.bin
6e385ede50b45559647b40595b5710f3dd21e322b0eb0e08a76cdb05e743aab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 11208 bytes

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