Malicious PDF — malware analysis report

Static analysis result for SHA-256 728c113e0f1ef199…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 09:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90dbe1714cf56bcb4c2720887a7c4f26 SHA-1: f89401ebbf1822fb6ea8944f7e1c5a6681449677 SHA-256: 728c113e0f1ef199d1e73a798a4f61495bb761b334226257496ae1a8cdbb0e51
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests a social engineering attempt to trick the user into visiting a malicious website, likely to download further malware or steal credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=angularjs+batarang+chrome
    • http://files.flowersfromsarahsgarden.com/uploads/1/3/0/7/130775520/wulemosekebom.pdf
    • http://files.pubquizprep.com/uploads/1/3/2/6/132695839/6560888.pdf
    • http://puvitine.rockheightsvacationrental.com/uploads/1/3/1/0/131070934/4119553.pdf
    • http://taxale.theencouragementproject.org/uploads/1/3/0/7/130775934/6387986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/free_excel_2020_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/6069543209.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1493/files/iris_battlefield_airlifter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/mukavutosoxasud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/mubujadekamor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/jikanubiwazujewotawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0435/2586/5636/files/zuxikasawowuwezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0437/2001/6021/files/lopedopemafokafunujemid.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/tifabaguredekimuz.pdf
    • https://cdn.shopify.com/s/files/1/0449/4196/7528/files/benefits_of_effective_communication_in_an_organization.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/zumajizila.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_off000058e7.bin
0604c3e419aa68050e3409d822857525e1bdb884e09287d728d7dfc25a9b729e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E7 5420 bytes
font_01_sfnt_off00006b24.bin
6075fc38a1579a8b3744ff7aadd87b0e9390a2cbaccc4d3c94c5940d310f4e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B24 10292 bytes

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