Malicious PDF — malware analysis report

Static analysis result for SHA-256 0440103513f45dd4…

MALICIOUS

PDF

33.9 KB Created: 2020-08-08 01:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4de8f1dcf15120e9ca1cb12a16a9d84a SHA-1: 55e6981e2f796a7bf24a95360e0dbea130a13258 SHA-256: 0440103513f45dd4677e906bbfdd8fd16e94aa65443e6d8c505c2c7d647f8daa
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=diccionario+b%25C3%25ADblico+nelson+pdf'. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure.

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.com/pify?keyword=diccionario+b%25C3%25ADblico+nelson+pdf
    • http://files.mrstuckeysclass.com/uploads/1/3/0/7/130776841/4143467.pdf
    • http://files.981themarcoislandfm.com/uploads/1/3/0/7/130775565/gojofof_fubeduwowir.pdf
    • http://files.syrettdesigns.com/uploads/1/3/0/9/130969572/6900653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/make_aol_my_homepage.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/80451854340.pdf
    • https://cdn.shopify.com/s/files/1/0440/0106/7166/files/sukifexezujulemefonedalaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/multivariate_analysis_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/3946391866.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/gevigivatisafivasisife.pdf
    • https://cdn.shopify.com/s/files/1/0432/1420/9186/files/9247966435.pdf
    • https://cdn.shopify.com/s/files/1/0434/5980/5350/files/26072228910.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/wufikuxexabup.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/asset_management_system_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0455/7848/5925/files/boogie_nights_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5842/files/zorenajetizuxeriz.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_off00004705.bin
9450f96871bb9ee120ac05a3d01564354f1692816e8b0af3343801820444cf99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4705 5344 bytes
font_01_sfnt_off00005942.bin
671777c085d76872c3c85f8affa1042b290cdace7c839fb692770cd8e099ec32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5942 9696 bytes

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