Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad40eb4374db336c…

MALICIOUS

PDF

47.6 KB Created: 2020-08-04 16:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218460b6861a0381959d34c89a275de9 SHA-1: 9edb8933d4db4c1d42b89a5df036f90398d57139 SHA-256: ad40eb4374db336c5fdce855b8778b5ea499ed79026533685a6df879772e0536
130 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for a 'medical certificate download'. The PDF_SEO_LINK_FARM heuristic indicates the document is part of a larger campaign to generate traffic through numerous links. No scripts were extracted from this sample.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bcece+medical+certificate+format+pdf+download
    • http://files.new-style-trailer.com/uploads/1/3/1/1/131163578/8a106.pdf
    • http://files.ioasas.com/uploads/1/3/1/1/131163953/fefupovesod.pdf
    • http://kimixes.wonderful-tw.net/uploads/1/3/2/6/132695663/9991420.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/zusimidafepidudu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6688/files/89089594843.pdf
    • https://cdn.shopify.com/s/files/1/0436/4707/4464/files/columbia_md_21045_weather.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/gastroenteritis_pada_anak_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/14087757155.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/49374879812.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/mobomarket_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0440/8115/2152/files/dixon_zero_turn.pdf
    • https://cdn.shopify.com/s/files/1/0445/7309/8143/files/how_to_make_ender_portal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/40858417623.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/66300854277.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006494.bin
8a185cd50803b921bc63dbafbc2214ab9ff932d050386e854fbc786ce37ef357
pdf-font-stream PDF embedded font (sfnt) at offset 0x6494 5052 bytes
font_01_sfnt_off000075ad.bin
f340c5b89be31d8283b5e3b9c653661a061397976dfea3637b781d199d073de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AD 14716 bytes
font_02_sfnt_off0000a37b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA37B 4324 bytes