Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7a217d9fe1643a…

MALICIOUS

PDF

38.1 KB Created: 2020-08-13 08:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 350f85bfdcf8ef0f159ef073b6af30cd SHA-1: acdef178e6c4b3ffb1365c2c8d2dffd338b0acbf SHA-256: 5e7a217d9fe1643a674181a6cc8e1d2f55218a5ce719b20ec7101e5b69fc1c3a
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, and a visual download button lure. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=past%20continuous%20exercises%20pre%20intermediate%20pdf
    • http://files.yeyeluisahteish.com/uploads/1/3/1/3/131379946/d755e.pdf
    • http://files.templecitypoodles.ca/uploads/1/3/1/4/131454766/wojinolokexip.pdf
    • http://files.assemblyrowoffices.com/uploads/1/3/0/8/130814535/4e37c16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/bruno_latour_reassembling_the_social.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/22215488822.pdf
    • https://cdn.shopify.com/s/files/1/0438/5590/4918/files/63904191523.pdf
    • https://cdn.shopify.com/s/files/1/0429/4161/2199/files/miwoxut.pdf
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/92238577603.pdf
    • https://cdn.shopify.com/s/files/1/0429/9689/1807/files/24735781812.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/sesudogoziginitadeleni.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/pukikogesopixorilojet.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/gedinineduwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/61644972264.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/41731619609.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_off0000575b.bin
7eb335ed04d30decf72df1ca0662917b34b7cc5ef79e55bdaee05805fb8b4d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575B 5336 bytes
font_01_sfnt_off00006964.bin
bbf8483f33dfd54ec97cba924d5485c591b75d9e4cef07a3e34f466cba649224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6964 9996 bytes

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