Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff66dd6c33051658…

MALICIOUS

PDF

62.2 KB Created: 2020-08-07 09:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c05c948e866061a0b09f5d2a17e9f7 SHA-1: 98a74aad0c9a165bdbf47e2af22f3dbffe6086b9 SHA-256: ff66dd6c33051658b6346b1bd6ab2404f0e304f840eec0bfc7243b440b030df4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious due to a high number of embedded links, many of which lead to external PDF files. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=materialismo+dialectico+pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL and a large number of benign-looking Shopify URLs, suggesting a link farm or SEO manipulation tactic.

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.ru/pify?keyword=materialismo+dialectico+pdf
    • http://files.nataliemclaurin.com/uploads/1/3/0/8/130814644/2660374.pdf
    • http://files.oafieldhockey.com/uploads/1/3/0/8/130874134/16cc9.pdf
    • http://files.lepopupusa.com/uploads/1/3/2/6/132696604/74509f51.pdf
    • http://files.playwithfireproductions.com/uploads/1/3/2/7/132740685/nuvato.pdf
    • http://files.thinkingthrough.org/uploads/1/3/1/4/131437380/kiduziduvagir_womirugum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasexenumufuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/84051941439.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5832/files/poxavuwemefogilezisixiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8274/files/51767358507.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/broiler_production.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/75193534694.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/vejafefufalifanax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/mapa_casa_de_campo_madrid.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/76135098331.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/sipumano.pdf
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/international_accounting_standard_36.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.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_off0000b4bb.bin
6477291e5ce8db86d99de7c52b89d4f3e2c0094c06d9ebd1dc31465df2a59315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 5304 bytes
font_01_sfnt_off0000c6bb.bin
453f2747835f17b275285873b2b8a6ce8b4f6db013a6709787507da01e7027ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 10876 bytes

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