Malicious PDF — malware analysis report

Static analysis result for SHA-256 82374f0cf4c861d5…

MALICIOUS

PDF

47.7 KB Created: 2020-08-31 18:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ad9c6666f23e0bf7417cace95868a6c SHA-1: db389388377764e9e7d2ce461892be72ea079253 SHA-256: 82374f0cf4c861d57a6b8fe7b24fc66b24200b2ef092063c8a009d7836f8d639
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to a 'Java 1.8 64 bit' download lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this malicious redirection. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier also 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.cc/wix?keyword=java+1.+8++64+bit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d1d005_8744741e455f460a8295d907b55a3dfc.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_a4a2e87e7563437a892ff57fa77a1c56.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4109fc4c02c44388a43e787be9f560f.pdf
    • https://static.usrfiles.com/ugd/f55bec_ef55603384b34fd9bc7e3ddd0f5a0b40.pdf
    • https://static.usrfiles.com/ugd/b8c837_32e17859efe84569b320a1a9966ec6cb.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/zolilogafosijuxavaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/9259/0236/files/8_month_pregnancy_scanning_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/49516913283.pdf
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/george_orwell_1984_download.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/english_syntactic_structures_aarts.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/agricultural_economic_and_extension.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61286624564.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/miwetubojojerewi.pdf
    • https://static.usrfiles.com/ugd/c6ac46_a976e6b74d3a445d9c7507531144e5bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_774efeb839ad48a9a590285939142e34.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_off00007a14.bin
a1d3f0fe5648c818caa3951e9e7aedf32cb5024787ad903048f579350f4c351e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A14 5084 bytes
font_01_sfnt_off00008b93.bin
e8aceef0ed22df78fb56d4517482f0e99342cd5f4fdb5d60cb7e8cb72fa2be2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 10892 bytes

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