Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4e54b4a41e0609…

MALICIOUS

PDF

44.3 KB Created: 2020-08-08 09:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c46b61a3f05312356087122fc66f5ae4 SHA-1: 84fff8d242b528ce4dcae8d7b5fe2e44c2658cec SHA-256: cd4e54b4a41e06098123c8a6f527735f8a13f5092ce7a72e3973bbfd8252c106
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and text related to sickle cell anemia, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=sickle+cell+anaemia+causes+signs+symptoms+and+treatment+pdf
    • http://files.andrehugosplace.com/uploads/1/3/0/8/130814921/933911b16640d4d.pdf
    • http://files.laurelwoodna.org/uploads/1/3/1/3/131383297/zabixizut.pdf
    • http://bidadozuw.rlbproductions.com/uploads/1/3/0/8/130813765/3949ac.pdf
    • https://cdn.shopify.com/s/files/1/0445/4970/1796/files/differences_between_american_and_british_english_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/archangel_s_shadows_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4166/files/puniniwakikafibibipada.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3201/files/javascript_to_string.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/49373414047.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/nhl_all_star_game_2017_tickets.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/democracia_socialista.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/fewukikuzolu.pdf
    • https://cdn.shopify.com/s/files/1/0439/5565/0718/files/moxepusanelivizikukadowoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/convert_base64_string_to_python.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_off00006dc4.bin
77297685ea8d97d499e9cd2edee73efbb2cdbb63b62c23c7abdd2c72bac63ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC4 5744 bytes
font_01_sfnt_off0000814a.bin
57ebe036b8de103f94d2d66f2b1d6572b5f4f81115bf4df6949d9e99182796cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814A 10252 bytes

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