Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c65830de0f46d65…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 04:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cac45c3fe982547a8e7f46a3c3ae1872 SHA-1: fea7c5b3c2ac80e19ff3164f0b1bce1ff8b73da0 SHA-256: 7c65830de0f46d654e31c92d06f15b87773f808125458fb29c7a05c8074b8aed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains references to the redirector URL and other PDF files, suggesting a link farm or redirection scheme designed to lead users to malicious content.

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.cc/pify?keyword=le+systeme+bielle+manivelle+pdf
    • http://files.dndforwomen.com/uploads/1/3/0/9/130968996/6145718.pdf
    • http://files.sdgeranium.org/uploads/1/3/1/0/131070792/719629.pdf
    • http://files.nikkipinkwriter.com/uploads/1/3/1/4/131483254/zediva_zumifumipir_doxelanirewij_ruzuzuje.pdf
    • http://tosazuw.crossroads-engineering.com/uploads/1/3/1/6/131606479/6935157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/lalav.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8156/files/73026956858.pdf
    • https://cdn.shopify.com/s/files/1/0430/2641/5779/files/discrete_mathematics_5th_edition_dossey.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/xexolameraluvekiwidupex.pdf
    • https://cdn.shopify.com/s/files/1/0432/7633/7318/files/dibosot.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/jufegobexadoxut.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/jarurevajigewokunapixumel.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/gogemefenawuxofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/ligodubulolitaxupe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0268/files/togam.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/bignoniaceae_family.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/54712069097.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e72.bin
dba3104ba454a7abccda82e90384debba1f9ca0ab025430b191cdbf5a9897dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E72 5336 bytes
font_01_sfnt_off00007091.bin
bb44addd6d58e7f23fc8b5489c1659a6af99dee72d919d70cfc1ddb33e294788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7091 11868 bytes

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