Malicious PDF — malware analysis report

Static analysis result for SHA-256 437b3448f11dfee3…

MALICIOUS

PDF

35.4 KB Created: 2020-08-20 11:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f65e104bfb71174e9a920020b3485e7 SHA-1: dcd845a9fccada2bd2e362342b9b4a8837a99e2b SHA-256: 437b3448f11dfee3142d46ee2c771c70b8b9f5d8ecee0918da70fa1d166d2d20
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wb?keyword=semi%20detailed%20lesson%20plan%20in%20math%20kindergarten%20pdf', is designed to lure victims by appearing to offer educational material. The PDF also exhibits characteristics of a link farm, embedding numerous other PDF links, many of which point to benign content on Shopify, but the primary redirector is malicious. No scripts were extracted, but the presence of the malicious redirector and the SEO link farm technique strongly suggest a phishing or redirection attack.

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/wb?keyword=semi%20detailed%20lesson%20plan%20in%20math%20kindergarten%20pdf
    • http://files.articulatetree.com/uploads/1/3/1/8/131871864/mixirapolalimodu.pdf
    • http://files.makooutfitters.com/uploads/1/3/1/3/131397973/temejiresurigesek.pdf
    • http://files.pathspersonalfinance.com/uploads/1/3/1/4/131407849/4551337.pdf
    • https://cdn.shopify.com/s/files/1/0450/1300/8534/files/java_tutorial_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/7170104558.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/as_10_revised_icai.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/242975238.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/12157056799.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/tratamento_da_pneumonia_bacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/59646669713.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8262/files/90648941397.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/6437130564.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_off000049df.bin
b455bca1a416bb5413785ac89c0bfe7f6e25dc285a711cb49d2f1f72fda4384d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DF 5620 bytes
font_01_sfnt_off00005cc5.bin
408bb3872b89db52dec50540e0ad4a8fb1944a342c196d8fb057d96cb010867d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC5 10444 bytes

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