Malicious PDF — malware analysis report

Static analysis result for SHA-256 47be44c8cb795217…

MALICIOUS

PDF

51.9 KB Created: 2020-09-18 06:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24bd79d38dac9bfbcb29ec9baf024cb0 SHA-1: 290797301e9cc70cede45e19b8fb78e0d9e67d45 SHA-256: 47be44c8cb795217192fa72987ae612cf032bffb9a3a1c97c28e871512863241
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Algebra 1 chapter 6 cumulative review answers' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO poisoning or distributing malicious links. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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.link/wix?keyword=algebra+1+chapter+6+cumulative+review+answers
    • http://zumet.t3volleyballclub.com/uploads/1/3/2/6/132683209/xekasasib.pdf
    • http://sebitugum.primarycareguidelines.com/uploads/1/3/2/8/132814742/sizojalomoj.pdf
    • http://wepejavi.truelindsaycreation.com/uploads/1/3/0/8/130874493/4946878.pdf
    • http://vosage.thelighthousebc.org/uploads/1/3/1/4/131407406/8d86556b65.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/alejandra_pizarnik_poems.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/18839535484.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/jozokuvoxifesupasasufaras.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/gugalidefugekasevosabaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/58246485283.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/harrismith_topographic_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/mofate.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/guguwadorejezaraxeja.pdf
    • https://d76ae117-6136-4de2-80ae-567f079f72ae.filesusr.com/ugd/dd6616_6bb0c6b09c48495095639866baa4b4a2.pdf?index=true
    • https://3d9d4f6e-c2f6-40e5-af86-24798942894a.filesusr.com/ugd/0ebc1f_d9ca1601044a4182a41ce6873e5cf2fe.pdf?index=true
    • https://2dd3307d-465e-4218-9929-136761cf0ff0.filesusr.com/ugd/bbd3cf_c83a4816e4944f21b41ba48b747d0903.pdf?index=true
    • https://bc2f5dc2-3952-4a55-82a7-12bb7b594127.filesusr.com/ugd/1a1092_909c142eb91948fa909fc33a1fa28f5c.pdf?index=true
    • https://06711d8a-af90-49c1-828a-68486bcdb6c3.filesusr.com/ugd/8508de_303a4dd6713544658997690e1d3076c9.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088ab.bin
5776bc5c1fe9ff598df04de8e630607d9f3125df9921c13a7eda96cfa03cdaff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AB 5836 bytes
font_01_sfnt_off00009c78.bin
dab1005a03b4458802e54ae3dc7ee6af8e295a888123eb443d833465c07d2e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C78 10988 bytes

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