PDF malware analysis — malicious · dc4b4a162942a3a4

MALICIOUS

PDF

37.2 KB Created: 2020-09-03 02:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 275bcfdef4fe8f202f6df70fba82df49 SHA-1: f493699c12062c61a5b76997b7a4c5012fa4eecb SHA-256: dc4b4a162942a3a46d2ac9161d606a3c0cf50ac0c8f1734c9deda615b025530b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.club/wix?keyword=factoring+polynomials+practice+sheet', is the primary indicator of malicious intent. The document's content is a lure, disguised as an educational resource, to trick users into clicking the malicious link. No scripts were extracted, and the PDF structure itself did not reveal further malicious behavior beyond the embedded link.

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.club/wix?keyword=factoring+polynomials+practice+sheet
- https://cdn.shopify.com/s/files/1/0428/6195/3191/files/23969340091.pdf
- https://cdn.shopify.com/s/files/1/0437/1510/0840/files/13885192078.pdf
- https://cdn.shopify.com/s/files/1/0431/5742/2229/files/convert_to_mov.pdf
- https://static.usrfiles.com/ugd/7182f3_e47215fdf4a846ac9e409ee1feba2820.pdf
- https://static.usrfiles.com/ugd/44b221_65659856ae23422b9daf8c88f1d940e5.pdf
- https://static.usrfiles.com/ugd/5b604d_fe0b804220d940ce82c2b21a0ef819c8.pdf
- https://cdn.shopify.com/s/files/1/0430/9601/5002/files/49607671519.pdf
- https://cdn.shopify.com/s/files/1/0434/3716/2657/files/systematic_risk_and_unsystematic_risk.pdf
- https://cdn.shopify.com/s/files/1/0433/2634/1272/files/juggernaut_training_method_excel_spreadsheet.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000046b2.bin` `6519e47f95052abe45a1661a30655cff3ff8f4ba314d7e9eb8733e50530872ba`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x46B2	5192 bytes
`font_01_sfnt_off0000582a.bin` `3ef9a94f16ddd36fbd7d9248a6f0c0e92e2ef431b8995fae137531d36247daa0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x582A	9948 bytes
`font_02_sfnt_off00007a3c.bin` `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A3C	4324 bytes

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