PDF malware analysis — malicious · 16bb0d4be8ccaceb

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 15:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 26a2317dc14a823998cb121f30063410 SHA-1: 423b590eabdd900eb31d481a89ae13f4c3f319e3 SHA-256: 16bb0d4be8ccacebe7471a5bfe03162930f980c47b869b34f5c20144e431668e

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to worksheets and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicates maliciousness.

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.com/wix?keyword=greater+than+less+than+worksheets+examples
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/d01287_4528718ef13c4fe7875047cef8f0ecbb.pdf
- https://static.usrfiles.com/ugd/b8c837_f872e80152084739b4d1b42d023644cb.pdf
- https://static.usrfiles.com/ugd/599026_4e0cecddf1c94661ad4dccd12d676951.pdf
- https://static.usrfiles.com/ugd/b8c837_86be33b931344efba0f429b74e7e9e4c.pdf
- https://static.usrfiles.com/ugd/87d215_a34e28b5316e42559b33e3311450a9d4.pdf
- https://static.usrfiles.com/ugd/b8c837_caaba8d62c9f49278d45ca32e7757fe3.pdf
- https://static.usrfiles.com/ugd/e32576_7e36e0953b4745e1a4efccb8fcc50cd8.pdf
- https://cdn.shopify.com/s/files/1/0435/8402/8833/files/23637665144.pdf
- https://cdn.shopify.com/s/files/1/0429/8797/8905/files/how_to_write_a_character_witness_statement.pdf
- https://cdn.shopify.com/s/files/1/0435/0715/5110/files/39423749281.pdf
- https://cdn.shopify.com/s/files/1/0431/0718/8898/files/2552326795.pdf
- https://cdn.shopify.com/s/files/1/0432/0854/0324/files/51041738811.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000575c.bin` `19f8a624ed5bfcee933e74ab0c800817e1bcab5f21afbf485d4116a58902a390`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x575C	5316 bytes
`font_01_sfnt_off00006958.bin` `1e220e1c20580d4fb203a15513cc84a73382379d175b5c8ca744523d523cc0e7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6958	9892 bytes

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