Malicious PDF — malware analysis report

Static analysis result for SHA-256 10024ed37969fb17…

MALICIOUS

PDF

44.0 KB Created: 2020-11-06 04:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2284e3f7d9e563b015c2b2af05882e30 SHA-1: 937c7f757bc133b2a031787437ff086e5c9b6fd1 SHA-256: 10024ed37969fb17b95c80dfca837f0f3c5e478b9ebca382db6868b3eaa15a7b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://trafficel.ru/strik?keyword=level+22+b+cubed, appears to be part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?keyword=level+22+b+cubed
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f875cccb9255.pdf
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/6394725.pdf
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f9c968d41236.pdf
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/fabad-labovuwukikozaf-vibasezaniwut-sezofigu.pdf
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5f973ea19b58b.pdf
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f89588f5f22c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luborinizu/broussard_middle_school_lafayette_parish.pdf
    • https://uploads.strikinglycdn.com/files/13728e0c-2b49-4543-8fc2-73cdf99af1dc/73703953877.pdf
    • https://s3.amazonaws.com/wilugugo/principles_of_genetics_textbook.pdf
    • https://s3.amazonaws.com/guvovigo/vosedifezubatojokuraneda.pdf
    • https://s3.amazonaws.com/toliwudalamem/nelusanelofefogemikemibuf.pdf
    • https://uploads.strikinglycdn.com/files/87fbb318-eeb7-45a4-aab3-5b870c495a09/advocacy_job_cover_letter.pdf
    • https://s3.amazonaws.com/rotafasaniz/82346472715.pdf
    • https://uploads.strikinglycdn.com/files/fd5bbe18-d3ba-42ca-a81c-fe74c9ea8cab/python_for_dummies.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a71.bin
242040dff6ac6d3eb1016b20b37db1b2df05d48a342a9c91610e12ecd5bcfb45
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A71 4724 bytes
font_01_sfnt_off00006a9f.bin
c4b39da0ee2c6ccb0040e87981aa203a83f8a5b30ac273613a5268af2fb15f92
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9F 10332 bytes
font_02_sfnt_off00008e1e.bin
b99f3422495d7000f36add31b3ea8bcefcdd5e5fae1582619ff78f5357176837
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1E 16164 bytes