Malicious PDF — malware analysis report

Static analysis result for SHA-256 488fa62809c360b0…

MALICIOUS

PDF

38.6 KB Created: 2020-08-11 15:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0351275fcd77063cfdba62004e971d4 SHA-1: 43cda86a961eaf9b75437200e6a678e2634912ac SHA-256: 488fa62809c360b0fc3c08f402e9689470db4d8fe802099066a57039449077ce
150 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 benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a free PDF download. This suggests the primary goal is to redirect users to malicious infrastructure.

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.ru/pify?keyword=architect+s+studio+companion+pdf+free
    • http://files.motisbusinesscentre.com/uploads/1/3/2/7/132740327/3625901.pdf
    • http://files.oscarconstruction1.com/uploads/1/3/2/6/132681464/1994782.pdf
    • http://files.americanenglishsounds.net/uploads/1/3/0/7/130739202/rebogabije.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/curso_de_adestramento_canino.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/1308412124.pdf
    • https://cdn.shopify.com/s/files/1/0435/8668/3037/files/lirolezosaxuroveb.pdf
    • https://cdn.shopify.com/s/files/1/0438/1802/5122/files/organic_experiments_williamson_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/wubokepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/55047859367.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/77200250961.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/arti_simbol_flowchart.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/34138509562.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51730359377.pdf
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/google_classroom_tutorial_em_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/26786666356.pdf
    • https://cdn.shopify.com/s/files/1/0431/9500/7137/files/mimabo.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_off000056c9.bin
954f429f73846206a41e2139b6757dcd6544ff0101172ec500cac34001c67b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C9 5352 bytes
font_01_sfnt_off000068d2.bin
99882731b8f614aeef099d32ffcc17c640144b65bc6a825be32be74844b773e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 10304 bytes

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