Malicious PDF — malware analysis report

Static analysis result for SHA-256 157b660d7f9d13e6…

MALICIOUS

PDF

51.0 KB Created: 2020-08-12 21:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858af7445b3ecbaf9c4aac1cb7103df8 SHA-1: 0a13674c335279dba558f04123b91d4f0ff9769b SHA-256: 157b660d7f9d13e64f856a8df02e00af05cce9cef61c1af9d747f377a09c28be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme to drive traffic to malicious sites.

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=receptive+language+activities+pdf
    • http://files.majellbackhausen.com/uploads/1/3/2/6/132683040/kafuneb.pdf
    • http://files.pcycompany.com/uploads/1/3/1/1/131163718/ripumexu.pdf
    • http://files.revitforid.com/uploads/1/3/1/3/131381374/durevajob-dutemegegozajej.pdf
    • http://files.valnettoyage-sarl.ch/uploads/1/3/2/6/132695749/fanor.pdf
    • http://jokiduxon.northstatekleekai.com/uploads/1/3/0/9/130969723/682c83a48ec38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/advanced_engineering_mathematics_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/14896516220.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/mowawaxetisiwasox.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/11274344216.pdf
    • https://cdn.shopify.com/s/files/1/0431/5329/3469/files/46648983064.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0449/3810/0891/files/dijisilufarebuxem.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/sojew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/93002866992.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/boxozeki.pdf
    • https://cdn.shopify.com/s/files/1/0434/6832/5029/files/22898749845.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65431134640.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_off000088d8.bin
41b4d47742465c06820b2aebc8a114f3822761b4a834b6b772378d56098c907b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D8 5292 bytes
font_01_sfnt_off00009af4.bin
1f290a499f1f803e613cd96cf3f0a67e7319743d950f064a2a081bcd637a3276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF4 10512 bytes

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