Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40dc8e0798a4e42…

MALICIOUS

PDF

50.1 KB Created: 2020-10-28 23:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2961b6434d0a46189aeff62b146f5f28 SHA-1: 7e9914a763e718e5745dbbad17c0d3fbf0a98545 SHA-256: a40dc8e0798a4e426a47d41ffef9e23d85aee19f4e58af80a9a9b1d3880245f1
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 a redirector infrastructure. The document body is obfuscated but contains a URL that appears to be a lure for users seeking worksheet answers. The ML classifier strongly indicates maliciousness, and the presence of a redirector link confirms the intent to lead users to potentially harmful content.

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/123?keyword=geometry+7.3+practice+b+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f94f819b0a24.pdf
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f88bec8bfe7d.pdf
    • https://cdn-cms.f-static.net/uploads/4413361/normal_5f95ebd3da073.pdf
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f9283f0573c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rorives/jetejotozaratog.pdf
    • https://s3.amazonaws.com/kibavutibeved/77125062745.pdf
    • https://cdn.shopify.com/s/files/1/0479/6694/5447/files/treasury_interagency_agreement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8252/2528/files/negutewikig.pdf
    • https://s3.amazonaws.com/bizamesuwepe/84055324090.pdf
    • https://s3.amazonaws.com/mudurixo/56003796654.pdf
    • https://s3.amazonaws.com/memul/momunemejaza.pdf
    • https://s3.amazonaws.com/henghuili-files/19938324678.pdf
    • https://s3.amazonaws.com/wilugugo/86889933906.pdf
    • https://s3.amazonaws.com/dudurat/vonadajopekoxoduxo.pdf
    • https://s3.amazonaws.com/migivewuwe/la_navidad_en_mexico_worksheet_in_english.pdf
    • https://s3.amazonaws.com/retisovojor/chelating_agents_and_metal_chelates.pdf
    • https://s3.amazonaws.com/pusori/certainteed_vinyl_siding_warranty.pdf
    • https://s3.amazonaws.com/podawakumepewez/tirokodigimogexigelakomad.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f32.bin
ee334a17de47541fe6360a47ccc7a555cef42e072ab0d69daf17eb5dbbab087c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F32 5636 bytes
font_01_sfnt_off00007251.bin
b67e1fe12e5e33568da494a53db0caf865864c0aeefcfef63e117b9fc715d74c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 10912 bytes
font_02_sfnt_off00009776.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9776 16144 bytes
font_03_sfnt_off0000ac75.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC75 4324 bytes

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