Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dac4eb02d57187…

MALICIOUS

PDF

45.6 KB Created: 2020-07-31 20:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf2ffac35a1ace2a0cfb83cf74c6997 SHA-1: bfaddd89fc48b6f198acce8a9b2bc35bf083c595 SHA-256: 12dac4eb02d57187cb8ff74dcd97e6e6fd732d63746c6274e7a032ce0603a022
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly indicates maliciousness.

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=minecraft+iron+level
    • http://files.northparentpress.com/uploads/1/3/0/7/130775728/9745002.pdf
    • http://files.lcorelca.org/uploads/1/3/1/3/131398222/foxanep-nakiledo-getefaluvazonak.pdf
    • http://files.portugalmatchworn.com/uploads/1/3/0/9/130969800/6761983.pdf
    • http://files.cisenoughisenough.org/uploads/1/3/0/7/130775784/3828333.pdf
    • http://files.boilingfrogproductions.com/uploads/1/3/0/7/130739052/gufotuvugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/0586/2307/files/golagiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7127/4146/files/6403872658.pdf
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/guwuvalenexek.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/rawirasewefiritononazofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/85445360267.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/lajijaboxux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/gukizepojelez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovaratumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/14288023060.pdf
    • https://cdn.shopify.com/s/files/1/0440/6195/0117/files/18691603465.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/93250118551.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/vipajagadakezosekajinox.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000685b.bin
788759f46ff2739cec16d4c9b7285db1ea26c01b2f2641d69553109fd7fd67ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685B 4552 bytes
font_01_sfnt_off000077db.bin
0e5d5b6bec95af5a28acdaef31923cee85646a6f948c17b3cce8a649356fe667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 10444 bytes
font_02_sfnt_off00009b7d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7D 4324 bytes

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