PDF malware analysis — malicious · ff21ed5edc628a58

MALICIOUS

PDF

42.3 KB Created: 2020-08-17 02:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cf061dea1fe3f92e89262e35203ca833 SHA-1: e4b3e54a3f5b9a7c1594d8d87b0fcf2aab42c2c8 SHA-256: ff21ed5edc628a58e682f85946e8f26095c328c0950850bf9bec5e689d26e2af

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. This redirector is likely used to obscure the final destination, which could be a phishing page or a malware download. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and click-through rates. The ML classifier also strongly indicated 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.ru/pify?keyword=distributive+property+area+worksheet+3rd+grade
- http://files.troutbum.ca/uploads/1/3/2/7/132710655/046c6686a.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
- https://cdn.shopify.com/s/files/1/0431/0489/5143/files/basics_of_chess.pdf
- https://cdn.shopify.com/s/files/1/0434/2874/1272/files/kipebojejiliwadi.pdf
- https://cdn.shopify.com/s/files/1/0436/1807/4786/files/12523172997.pdf
- https://cdn.shopify.com/s/files/1/0431/1829/7245/files/65825864638.pdf
- https://cdn.shopify.com/s/files/1/0432/4609/2443/files/lutadikanegivowoka.pdf
- https://cdn.shopify.com/s/files/1/0430/4902/5690/files/45580105739.pdf
- https://cdn.shopify.com/s/files/1/0433/8316/0995/files/car_market_segmentation.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_off000051cf.bin` `27e6456b96a5221842d5c2226bb896fced5bd2e0ebc6944a4418f0aa4a57430f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x51CF	5808 bytes
`font_01_sfnt_off000065a0.bin` `ed73027b183661410172f2911f476df378e412ad77dcfdc01d744492015f5bee`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65A0	9836 bytes
`font_02_sfnt_off00008780.bin` `edc33fe94617b35fa5734827a91efdc9665031ac3a5a8b8018a6396f4204b3d2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8780	16116 bytes

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