Malicious PDF — malware analysis report

Static analysis result for SHA-256 7500b40816dd0c72…

MALICIOUS

PDF

45.3 KB Created: 2020-09-16 21:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf8b5560f4ef181bf296110a911d8cd SHA-1: 581d745460df05f06c1c06704d7211c4a2d761c5 SHA-256: 7500b40816dd0c7241042b765da9f04c0e4c1f2667c7ba75cbefd833fd0bf01e
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as educational material, but it redirects to a malicious URL. The primary malicious link identified is https://ttraff.me/wix?keyword=2.3+elements+and+compounds+worksheet+answers, which is likely intended to host a further stage of the attack. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=2.3+elements+and+compounds+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/36082364133.pdf
    • https://cdn.shopify.com/s/files/1/0431/6033/8586/files/nezotalevameganomegubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89186344985.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/65707657619.pdf
    • https://c0beee61-e4d7-4a36-8208-f15db2705dd2.filesusr.com/ugd/665c20_5ec255d6f67747d0848fc124a56bb0ae.pdf?index=true
    • https://ee4cfefe-1ff2-4f07-815c-aaa9728ecb76.filesusr.com/ugd/a13bc2_1ac4581c65174033af2aa5fd2ae3b531.pdf?index=true
    • https://9bf21523-2b72-4cc9-82f7-dfb1b55212c6.filesusr.com/ugd/3be48b_dac5b590fc7a4e46bcdb17347d906755.pdf?index=true
    • https://9287bd70-b33f-46e5-8e40-4ea9ee831f31.filesusr.com/ugd/f9d4cd_71e5342b399e4b4da0e3a3f0c5b430e6.pdf?index=true
    • https://ece92991-880e-4be0-be11-8a15ca1475cf.filesusr.com/ugd/5af86b_8d4d9320218a42729cbcab08ee78c983.pdf?index=true
    • https://bcb768f0-fab0-456d-9436-42a09eb1d248.filesusr.com/ugd/86319b_8d55743099624e95a2adefcc844839f5.pdf?index=true
    • https://c36ff683-418c-4521-9c72-66387fbf2ab0.filesusr.com/ugd/83f04e_a970700d7f9c463bbb149518e4142801.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656b.bin
b0b983849f612f671b63ef4c273a85fadb11359f7cf9c1677a1797387bfd7910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 5536 bytes
font_01_sfnt_off0000780f.bin
4b41b1902d16b802810a4b6f84b4abc8c502e7ea49cde269d194d6f66889a9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 10080 bytes
font_02_sfnt_off00009a7d.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7D 4324 bytes

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